Drivability:Poor Idle Quality
AT OPERATING TEMPERATURE ENGINE WILL REV HIGHER.THAN NORMAL LIKE TRANSMISSION IS SLIPPING AT TIMES 2-3 3-4 I * could NOT DUPLICATE ANY ABNORMAL OR UNCHARACTERISTIC OPERATION AT ANYTIME DURING 25 MILE TEST DRIVE. VEHICLE OPERATING AS DESIGNED. TRANSMISSION FLUID LEVEL CHECK FULL AND CONDITION SHOWS NO INDICATION OF CONCERN. NO DTCS IN ANY MODULES RELATED TO ANY CUSTOMER CONCERNS. DEALER TECH TEST DROVE WITH CUSTOMER PREVIOUSLY AND DESCRIBED CUSTOMER DRIVING STYLE INDICATING  CUSTOMER INDUCING "ABORTED SHIFTS". CUSTOMER APPLYING MODERATE TO HEAVY ACCELERATION THE LETTING OFF, THEN APPLYING BRAKE OR ACCELERATION AGAIN.
THIS WILL PRODUCE A SITUATION WHERE TRANSMISSION WILL NOT BlE IN OPTIMAL ENGINE RPM RANGE TO RE-APPLY GEAR AND HAS TO ALLOW MOMENT FOR ENGINE RPM TO DECREASE OR INCREASE BASED ON DEMAND. THIS IS NORMAL OPERATION AND NO REPAIRS SHOULD BE ATTEMPTED. CUSTOMER HAS UNREALISTIC EXPECTATIONS FOR VEHICLE OPERATION. NO REPAIRS NEEDED, PERFORMED, OR RECOMMENDED. VEHICLE OPERATING AS DESIGNED.
THE TRUCK IS IDLING ROUGHER AT TIMES
AFTER WE DID THE ENGINE REPAIR TO IT. * NO WORK PERFORMED. THE VEHICLE CHECKED FINE.
THE VEHICLE IS MISFIRING. THE CUSTOMER STATES THAI WHEN AT LOW SLEEP THE VEHICLE WILL BEGIN TO JUMP AND THE CHECK ENGINE LIGHT WILL COME ON AND BEGIN TO. * INSPECTION COMPLETED.
THE CK ENGINE LIGHT IS ON. JERKING WHEN STOPPED IN GEAR * found dtc ÑОÐОО for a cyl misfire. Connected vehicle to gds2 and looked at misfire counters. Found slight misfire on cyl #4. Removed spark plug and coil in cyl 4 and inspected. Found no visual issues. Performed spark test and found an adequate spark. Performed compression test across all cylinders and found them all to be in the 240-2S0 psi range. Swapped spark plug to cyl 1 and misfire changed to cyl 1. Removed spark plug again and found when tapping it on NY hand the node would drop out from the bottom of it replaced the spark plug and road-tested vehicle. Cleared codes
customer states the vehicle feels like it wants to shut off. * CHECKED VEHICLE CHECKED OUT OK UNABLE TO DUPLICATE CONCERN. CHECKED FOR CODES, BULLETINS, AND UPDATES NONE FOUND VEHICLE WORKING PROPERLY.
AFTER FILLING UP CAR SHUT OFF AND C.E.L ON RUNNING ROUGH * Battery - Test Charge Retest and Replace
All Others (0 - Low Skilled)
Engine Performance Concern [Customer States the vehicle will idle rough...engine revs higher than normal at 60 mph.. has been going on for 5 months... intermittent issue happens 5 of 10 times... feels like a lack of acceleration at 50mph] * UNABLE TO VERIFY CUSTOMERS CONCERNS AFTER ROAD TEST OF VEHICLE. SCANNED FOR CODES, NONE FOUND. SEARCHED FOR TSB/STAR CASES, NONE FOUND. NO UPDATES ARE AVAILABLE FOR MODULES. HOISTED VEHICLE AND PERFORMED VISUAL INSPECTION, NO ABNORMALITIES FOUND. RECOMMENDED CUSTOMERS COME FOR ROAD TESTS TO DUPLICATE CONCERNS AND POSSIBLY PROVIDE MORE INFORMATION PERTAINING TO CONCERNS.
ENGINE RUNS ROUGH AT TIMES SCAN * COMPUTER Р0300 PERFORM DIAG AND FOUND #3 AND #6 LIFTER COLLAPSED AND #6 PUSHROD  BENT REMOVE CYLINDER HEADS AND INSPECT REPLACE ALL LIFTERS GUIDES AND 96 PUSHROD REPLACE ALL RELATED SEALS GASKETS ANS HEAD BOLTS FILL ALL FLUID LEVELS AND TEST DRIVE CLEAR CODES REPAIR COMPLETE
WHEN STARTING THE VEHICLE THERE IS A HIGH IDLE, AND WHEN THIS OCCURS THE AUTO HOLD DOES NOT FUNCTION PROPERLY (IF THE AUTO HOLD IS PRESSED THE CAR WILL STILL ROLL 4-5 FEET) * TEST DROVE THE VEHICLE WITH THE SERVICE MANAGER FOR 18 MILES TO DEMONSTRATE CONCERN, THE CUSTOMER WAS UNABLE TO DUPLICATE CONCERN ON THE TEST DRIVE. THE VEHICLE WAS ALSO TEST DRIVE BY SERVICE MANAGER WITH FSE FROM HYUNDAI IN THE PASSENGER SEAT FOR 18 MILES AND THE CONCERN WAS NOT DUPLICATED, THEN THE FSE FROM HYUNDAI TEST DROVE THE VEHICLE WITH THE SERVICE MANAGER IN THE PASSENGER SEAT AND WAS UNABLE TO DUPLICATE CONCERN. SCANNED FOR ACTIVE AND HISTORY DTC'S NON PRESENT. THE VEHICLE WAS TEST-DRIVEN A TOTAL OF 78 MILES. VEHICLE OPERATING CONSISTENT WITH PRODUCTION VEHICLES TESTED.
when an idle vehicle feels like it's misfiring. * scanned for codes no codes stored in the vehicle at
this time . no misfire present.
when going about 60 mph when she is coming to a stop then the rpm will drop really low and seem to almost stall out * ROAD TESTED 10 MILES INCLUDING ON THE HIGHWAY, NEVER FELT ALMOST STALLING
THE VEHICLES RMPâS WILL STAY AT 2K AND NOT GO ANY HIGHTER. WHEN SHE GOES TO ACCELORATE THE VEHICLE FEELS LIKE IT
IS SLIPPING AND THE MOTOR HAS A DEEP HUMMING SOUND. TOW-IN * 21314 TEST DROVE VEHICLE 130 MILES AND WAS UNABLE TO DUPLCATE CONCERN. VEHICLE HAD NO RELATED CODES AND TAC HAD NO RELATED CASES. FOUND VEHICLE IS TEST DROVE VEHICLE 130 MILES AND WAS UNABLE TO DUPLCATE CONCERN. VEHICLE HAD NO RELATED CODES AND TAC HAD NO RELATED CASES. FOUND VEHICLE IS TEST DROVE VEHICLE 186 MILES AND WAS UNABLE TO DUPLICATE CONCERN. VEHICLE HAD NO RELATED CODES AND TAC HAD NO RELATED CASES. TEST DROVE VEHICLE 186 AT HWY SPEEDS AND AT LOWER SPEEDS TO TRY AND DUPLICATE CONCERN AND WAS UNABLE TO DUPLICATE. FOUND VEHICLE IS OPERATING AS
DESIGNED AT THIS TIME. NO PROBLEM FOUND
ENGINE JERKS AND SURGING 55AND 80 CHECK ENGINE DID NOT COME ON. * scanned and test drove, p0304 stored in the event data, check #4 injector, ohm resistance higher than rest. Installed R8444791AA :INJECTOR: FUEL Installed 68363277AA :MODULE: ENGINE CONTROLLER Installed 68441874AA :CONNECTOR: INJECTOR replaced #4 injector and test drove, the vehicle has misfire under heavy, back probed and monitored #4 injector fire, weak from ECM. replaced ECM and programmed, test drove,  surging at higher speeds, star contacted, recommended replacing other 5 injectors, parts ordered but the customer picked up the vehicle on 7/3 and advised that the left fender liner was still off.
THERE IS A GRINDING/WHINING NOISE
FROM THE ENGINE IN THE MORNING ON A COLD START. * Installed YS 364 .- PULLEY - IDLER REMOVED DRIVE BELT AND SPUN PULLEYS. FOUND BOTH
UPPER IDLER PULLEYS TO BE EXCESSIVELY NOISY. REPLACED BOTH UPPER IDLER PULLEYS AND RECHECKED. NO OTHER NOISE HEARD AFTER REPAIR.
TUNE UP 6 CYLINDER (DOES NOT INCLUDE R&R
INTAKE MANIFOLD/GASKETS) 1429.99 PLUS TAX. * PERFORM 6 CYLINDER TUNEUP.
WHEN STOPPED THE VEHICLE IS STOPPED, THE RPMS NEEDLE BOUNCES BELOW 1000 RPMS AND THE VEHICLE SHAKES. CUSTOMER STATES THIS HAPPENS SPORADICALLY WHETHER THE
VEHICLE IS COLD OR HOT. * no problem found road tested vehicle, found vehicle operating as designed when compared to other vehicles of same model and year
SES LAMP IS ON; ALSO HAS A MISFIRE AND TRIES
TO DIE. * CODE P0301 CYLINDER ONE MISFIRE ; P0201 CYLINDER ONE INJECTOR OPEN; NEEDS INJECTOR SUB-HARNESS; PARTS ORDERED
REPLACED INJECTOR HARNESS; TEST DROVE AND VERIFIED REPAIR COMPLETE.
THE VEHICLE GETS REALLY LOUD WHEN JUST GOING DOWN THE ROAD. THE RPMS ARE BOUNCING UP AND DOWN. * 23295 SCANNED SYSTEM AND FOUND NO CODES STORES. TEST DROVE SHORT
DISTANCE BUT DID VERIFY A DROAN NOISE WHICH SOUNDS LIKE SOMETHING TO DO
WITH THE NOISE CANCELLATION SYSTEM. VEHICLE WILL HAVE TO BE BROUGHT
BACK AT A LATER DATE FOR DIAGNOSIS.
THE VEHICLE RAN VERY ROUGH. THE CUSTOMER NOTES IT WILL EITHER RUN SMOOTH
OR RUN ROUGH, * See above
THE VEHICLE STARTS SHAKING WHEN STOPPED AT A LIGHT. CUSTOMER HAS FOOT ON THE BRAKE AND THE VEHICLE HUMS AND BEGINS SHAKING, * vehicle operating as designed road tested vehicle, found vehicle operating as designed, made val, found no faults pertaining to issue, reprogrammed dme and pdk , road tested again, made val , found no faults
in system
THE VEHICLE IS MAKING A NOISE AND THE RPMS START BOUNCING. CUSTOMER STATES THE VEHICLE HAD A CHECK ENGINE LIGHT
COME ON AND WAS SHOWING REDUCED ENGINE POWER. CUSTOMER STATES
THE VEHICLE PERIODICALLY HAS A FAN RUNNING AFTER NO ONE HAS BEEN IN THE VEHICLE FOR A DAY. CUSTOMER STATES THE TOUCHSCREEN HAS BEEN FLICKERING. * 23639 FIELD ENGINEER ARRIVED AT 9:00AM AND PERFORMED VEHICLE INSPECTION. SUBMITTED ALL FINDINGS TO GM. FIELD ENGINEER LEFT AT 3:45. GM WILL CONTACT CUSTOMER.
VEHICLE FEELS ROUGH * LEFT KNOCK SENSOR FAULTY. VERIFIED CONCERN, TEST DROVE VEHICLE, FOUND VEHICLE STILL RUNNING ROUGH, CHECKED FOR FAULTS, FOUND NO FURTHER RELATED FAULTS ACTIVE, CONTINUED BY R&I SPARK PLUGS FOR ANY FOUL PLUGS, FOUND OK, CHECKED CYLINDER WALLS WITH ENDOSCOPE FOR ANY SCORING, FOUND OK, NORMAL WEAR PRESENT, PERFORMED COMPRESSION TEST, FOUND OK LESS THAN 10PSI VARIATION BETWEEN ALL CYLINDERS, PERFORMED SMOKE TEST FOR ANY AIR LEAKS, FOUND NO LEAKS PRESENT, CHECKED FUEL PRESSURE, FOUND OK AT 5BAR,
CONTINUED BY CHECKING ACTUAL VALUES FOR ROUGH RUNNING AND KNOCK SIGNALS, UPON READINGS, FOUND LEFT KNOCK SENSOR VALUES SPIKING INTERMITTENTLY, CHECKED WIRING AND CONNECTIONS FROM DME2 TO LEFT KNOCK SENSOR, FOUND OK LESS THAN 0.05OHMS, CONTINUED BY R&R LEFT KNOCK SENSOR AS IT WAS SUPPLYING ERRATIC READING AT TIMES CAUSING COMPLAIN, TEST
DROVE VEHICLE, VEHICLE OPERATING AS DESIGNED AFTER REPAIR.
CUST STATES;VEHICLE HAS VERY NOTICEABLE ENGINE MISS * 8569 // Found cylinder #5 misfiring, Check spark plug and and found it to be cracked, Replaced spark plug and wire, Looked at Miss fire data again and no miss fires were showing, Cleared codes and test drove vehicle, Rechecked no codes came back and looked at miss fire data again no miss fires showing up. // Found cylinder #5 misfiring, Check spark plug and and found it to be cracked, Replaced spark plug and wire, Looked at Miss fire data again and no miss fires were showing, Cleared codes and test drove vehicle, Rechecked no codes came back and
looked at miss fire data again no miss fires showing up.
VEHICLE IS NOT IDLING RIGHT, AND
VIBRATING. CUSTOMER THINKS ITS REAR MOTOR MOUNTS. * VEHICLE VIBRATES AT STOP LIGHTS
VERIFIED CAUSE TO BE MOTOR MOUNTS AND TRANS MOUNT, REPLACED ALL MOTOR MOUNTS AND VERIFIED VEHICLE NO LONGER VIBRATES
CK ENG IDLE VERY ROUGH AT RED LITES WITH
FOOR ON BRAKE PEDAL. * SEE LINE 2 ABOVE. SAME AS LINE 2
DRIVEABILITY/FUEL CONCERN
[ THROTTLE LIGHT ON CLUSTER AND
VEHICLE IS IDLING AT 2K RPMS ] * COULD  NOT DUPLICATE CUSTOMER CONCERN AT THIS TIME. INSPECTED CHARGING SYSTEM AND FOUND TO BE  OPERATING AS  DESIGNED. FOUND THE NEGATIVE BATTERY TERMINAL CLAMP TO BE LOOSE CAUSING THE VEHICLE TO SET CHARGING SYSTEM HIGH CODES.
RE-SECURED NEGATIVE TERMINAL CLAMP AND TEST DROVE VEHICLE. THE VEHICLE OPERATES AS DESIGNED AT THIS TIME.
D RUNNING ROUGH WHILE ON THE INTERSTATE, NO INDICATOR LIGHTS. * NC SEE LINE LINE, WAS UNABLE TO DUPLICATE
THE CONCERN.
ENGINE HAS A ROUGH IDLE * 0
THE VEHICLE WILL HAVE A VERY ROUGH IDLE AT TIMES. * N1 ТÐ?#3152119 DRIVE-IN/OUT. PERFORMED INITIAL ROAD TEST START MILES 6600 END MILES 6602 FOUND VEHICLE IDLE NORMAL. SCANNED VEHICLE FOR FAULT CODE FOUND P2B61-73 STORED IN PCM. RAN GUIDED DIAGNOSTIC POWERTRAIN/ENGINE PERFORMANCE/ IDLE SPEED NOT CORRECT,
SEARCHED FOR KNOWN TSB/SSM FOUND NONE RELATED NO FURTHER HELP
AVAILABLE. RAN MISFIRE APPLICATION AVERAGE FOUND CLY#1=2 CLY#2=4
CLY#3=1 CLY #4=1. CHECK MOTOR MOUNT FOR VACUUM HOLD=PASSED INSPECTED LINES NO OBVIOUS DAMAGE. ТÐ? OPENED #3152119. ТÐ? REQUEST MORE INFORMATION FROM CUSTOMER, RELAY BACK CUSTOMER RESPONSE. ТÐ? REQUEST TO DRIVE VEHICLE FOR EXTENDED ROAD TEST AND ATTACH SESSION FILE. PERFORMED ROAD TEST TOTAL OF 30 MILES ATTACH SESSION FILE. ТÐ? REQUEST TO UPDATE PCM AND PERFORMED QC ROAD TEST IF NO-FAULT PRESENT RELEASE VEHICLE. PERFORMED ROAD TEST 28 ADDITIONAL MILES READ/CLEARED CODES. FOUND NO FAULT IN SYSTEM RELEASED VEHICLE.
THE EPC LIGHT IS ON IN THE DASH, THE ENGINE RUNS POORLY AND THE LOW OIL AND LOW COOLANT LIGHTS HAVE BOTH COME ON THIS ALL STARTED OVER THE WEEKEND. * VERSION 1 (EMP# 783,15FEB21 16:11): 30558 fault for #1 misfire Sound ceil/connector not looked, on and came off coil added coolant no coolant leaks found checked oil level checked good
SHE WAS GOING DOWNHILL THE OTHER DAY AND WAS APPLYING THE BRAKES, STATES ENGINE STARTED TO REV ON ITS OWN. * UNABLE TO VERIFY CONCERN ON MULTIPLE ROAD TESTS NO FAULTS STORED. ENSURE PADDLE SHIFT SET TO SPORT ONLY
vehicle will have very rough idle at times. * N1 DRIVE-IN DRIVE OUT. COULD NOT DUPLICATE CONCERN AT THIS TIME. LOOKED FOR TSBS AND SSMS BUT NO SSMS OR TSBS ARE RELATED TO CONCERN- PULLED CODES AND NO CODES ARE APPLICABLE TO CONCERN LET VEHICLE  IDLE FOR TEN MINS AND REVVING ENGINE TO 2000 RPMS AND THE  BACK TO IDLE. COULD NOT DUPLICATE THE CONCERN.
THE VEHICLE WILL HAVE A ROUGH IDLE AT RANDOM. CHECK ENGINE LIGHT HAS
DISPLAYED. * NWP NO WORK PERFORMED.
Code P0301 indicates that Cylinder 1 had too many misfires within a predetermined period of time. * P0301 Cylinder 1 Misfire Detected
P0430 Catalyst System Efficiency Below Threshold (Bank 2)
P0201 InjectoÂ1 Circuit / Open - Cylinder 1
P0158 02 Circuit High Voltage (Bank 2, Sensor 2)
P0301 Cylinder 1 Misfire Detected
P0158 02 Circuit High Voltage (Bank 2, Senso 2)
P0301 Cylinder 1 Misfire Detected
P0201 Injector Circuit / Open - Cylinder 1
P0158 02 Circuit High Voltage (Bank 2, Sensor 2)