← Look into the faults of the GMC Yukon XL
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Check engine / Service Engine Soon: possible causes and documented repairs — 2000–2006 GMC Yukon XL
Of the records of the 2000–2006 GMC Yukon XL, 52 state “Check engine / Service Engine Soon” (Owner complaint: 22, Recall: 3, Manufacturer communication: 27). The technical documents say how to deal with 12 of its possible causes. They are listed by the number of matching records, most first.
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Causes the technical documents say how to deal with (12)
P0420 / P0430 on a new or just-replaced catalytic converter (break-in not completed)
4 matching records
An SES light may occur on low-mileage vehicles or vehicles that recently had the catalytic converter replaced.
DTCs P0420 and/or P0430 may be stored.
How to tell
What to do
- If the diagnostics still do not pass, perform SI diagnostics and repair as necessary.
- On a new/low mileage vehicle with these DTCs, use the Tech 2 to verify engine run time on the Engine Hour Meter in the IPC Data Display/Data 1 List.
- Finally, restart the engine and operate the vehicle at the conditions for running the DTC P0420/430 tests, and make sure the vehicle passes them.
- If this occurs, clear the DTCs and perform the drive cycle.
2 more steps ·All steps, part numbers and sources (3 sources) →
Single-cylinder misfire (P0300-P0308) and/or chirp, squeak or tick at camshaft speed: worn cam lobe / lifter, valve or valve spring
4 matching records
Customers may complain of an SES light, engine misfire and/or engine noise.
A verified noise is not eliminated by canceling fuel injectors and occurs at camshaft speed (half of crankshaft speed).
How to tell
What to do
- If pressing on the valve side of the rocker changes the noise, a lifter and/or cam lobe concern on that cylinder is most likely.
- The misfiring/ticking cylinder should have less cam lobe lift than comparison cylinders if a worn lifter roller and/or cam lobe is the cause.
- During the noise, press with a wooden hammer handle on the rocker arms at the valve side, push rod side, and side of the rocker to find which one is making noise.
- Measure the cam lobe lift at the push rod side of the rocker arm.
8 more steps ·All steps, part numbers and sources (6 sources) →
Reduced Engine Power from throttle body connector crimp, broken wire or grounds
4 matching records
A vehicle may come in for a reduced power message and DTCs P0120, P0220, P1516, P2101 or P2135.
The TAC / throttle body codes may be caused by a loose wiring crimp at the throttle body connector or a broken throttle body circuit.
How to tell
What to do
- Inspect all related throttle body terminals for a loose wiring crimp.
- Wire breaks usually occur within 1 to 4 inches (= 25.4–101.6 mm) of the throttle body connector.
- On C/K trucks, complete SI procedures for voltage drop on grounds G103 and G104; grounds G103 or G104 may be loose or corroded.
- If a terminal crimp or broken wire is found, repair or replace only the circuits involved.
Crankshaft position sensor may work intermittently or fail (8.1L V8) - recall 07V-521
1 matching record
The crankshaft position can operate intermittently or fail completely.
With intermittent operation the SES light may illuminate and the vehicle may run rough.
How to tell
- Check engine / Service Engine Soon
What to do
- Dealers replace the crankshaft position sensor.
- As the remedy, an improved CKP is installed.
- The repair listed for the claim is: replace the crankshaft position sensor and perform the Crankshaft Position System Variation Learn.
- Part: 12575172 Sensor, Crankshaft Position, quantity 1 per vehicle.
Fuel module reservoir assembly: fuel pump wire connectors may overheat - recall 05V-155
1 matching record
The fuel module reservoir assemblies contain fuel pump wire connectors that may overheat under certain operating conditions.
The terminals in the 4-wire electrical connector at the top of the fuel pump assembly may suffer fretting and high resistance.
How to tell
- Check engine / Service Engine Soon
What to do
- On-board emissions diagnostics may detect holes of approximately 0.040 inches (= 1.02 mm) or more and set a service engine soon warning light. The connector sits below the fuel level when the tank is full.
- Dealers remove the fuel tank and the module reservoir assemblies and install a new service kit.
- The bulletin explains how to install repair kit 15824379 on the fuel pump assembly; the kit contains replacement electrical connectors, a replacement fuel level sensor, related hardware and instructions.
- Installing the replacement connector components in the cover is a new procedure; the fuel level sensor is replaced by the existing SI procedure, but the float assembly is re-used, which is new.
5 more steps ·All steps, part numbers and sources (4 sources) →
Purge Solenoid: failed
1 matching record
Intermittent MIL, service lamps/messages or DTCs from connector fretting corrosion
No matching record (stated by the technical documents)
Intermittent illumination of the MIL, service lamps or service messages, or DTCs set by various control modules.
The passage is a heading about diagnosing and repairing fretting corrosion.
How to tell
- Check engine / Service Engine Soon
What to do
- Disconnect the affected connector and apply dielectric lubricant.
Intake manifold gasket leak (cold idle misfire, lean codes)
No matching record (stated by the technical documents)
The bulletin describes a cold engine idle misfire with DTCs P0171, P0174 or P0300.
The bulletin states the intake gasket seals may leak around the intake ports, causing the lean condition.
How to tell
What to do
- The seals may leak around the bottom side of the port, which makes the vacuum leak hard to detect.
- Lower-than-normal MAF readings may be seen if the intake seals are leaking.
- An intake manifold with warpage in excess of 3mm (.118 in.) over a 200mm (7.87-in.) area must be replaced.
- Measure the intake manifold for warpage across two runner ports only.
5 more steps ·All steps, part numbers and sources (3 sources) →
P0300 after engine repairs: injector connectors crossed (cylinders 5-7 / 6-8)
No matching record (stated by the technical documents)
Injector connectors for cylinders 5-7 and 6-8 can be crossed and cause an engine misfire.
The engine misfire may not be detected or may happen during deceleration.
How to tell
- P0300
- Check engine / Service Engine Soon
What to do
- If crossed injector connectors are a possible cause, use the applicable SI document to validate the injector connector routing.
- Correct the injector connector routing and re-evaluate.
DTC P0446 set with the SES lamp on (replace the EVAP vent solenoid, not the canister)
No matching record (stated by the technical documents)
How to tell
- P0446
- Check engine / Service Engine Soon
What to do
- Replace the EVAP vent solenoid.
Rear bank knock sensor corrosion from water intrusion (P0332)
No matching record (stated by the technical documents)
Customers may report mild to severe engine ping (spark knock), usually worse during acceleration, and/or an illuminated MIL.
The technician may find DTC P0332 set.
How to tell
What to do
- If P0327 and P0332 set at the same time, inspect for poor connections at the two-wire knock sensor harness located at the left rear side of the intake manifold near the top, just under the cover.
- Check the resistance of the knock sensors including the harness before reinstalling the intake manifold.
- Replace the rear bank knock sensor and build an RTV dam around the sensor to divert water away from it.
Throttle body carbon build-up: idle surge, reduced engine power, throttle DTCs (high mileage)
No matching record (stated by the technical documents)
As carbon builds up in the throttle body of a high-mileage vehicle, the ECM/PCM learns to compensate by increasing the throttle plate angle.
With enough carbon, idle surge, deceleration surge, tip-in hesitation, reduced engine power mode and/or DTCs may occur.
How to tell
What to do
- If SI diagnosis does not isolate the cause, inspect the throttle body bore and plate for obvious carbon build-up.
- If carbon is present, follow the Throttle Body Cleaning Procedure in SI.
- Depending on the vehicle, the idle learn reset/reset idle learn is normally found on the Tech 2 ECM menu for Module Set Up or Special Functions/TAC System.
- After ensuring that the throttle body bore and plate are clean, perform an idle learn reset/reset idle learn with the Tech 2/GDS and re-evaluate the concern.
Causes only records name
Not in the technical documents: named as the cause in records. A cause written in a complaint is the owner’s judgment or what a dealer said, not a confirmed fact.
Related symptoms, trouble codes and warning displays
What the technical documents state together with the faults above.
Put together by FaultCrate from public records and technical documents. The cause and the repair are for the workshop to decide with the vehicle in front of it. Counts are records, not failure rates.