Fuel Injector Driver Circuit Codes P0201 through P0208 - keywords connector harness pigtail P0202 P0203 P0204 P0205 P0206 P0207 terminal wire

The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

Intermittent SES or MIL light on with injector driver trouble codes P0201, P0202, P0203, P0204, P0205, P0206, P0207 or P0208 and bank shutdown trouble codes P2146 or P2149.

1. Complete normal SI diagnosis for the trouble codes set.
2. Injector circuit or injector coil tests may be normal until the engine reaches operating temperature, recheck circuit/injector resistance readings with warm engine.
3. Inspect for wire harness chafes on the Fuel Injection Control Module (FICM) wiring harness retaining bracket. This is an aluminum bracket very close to the FICM connectors. If any part of the taped portion of the harness is touching the FICM wiring harness retaining bracket, then you must look for chaffing on the wiring harness. It must be disconnected from the FICM and bent back towards the engine. Look for any chafes into the tape. If necessary peel the tape from the area and look for any chafes into the wires. Some of these chafes are very small, possibly the size of a pen tip, but could still cause injector circuit concerns.
4. If diagnosis is inconclusive, inspect the injector connections on all related cylinders. Pin drags and terminal tension can be checked with Kent Moore tool number J-35616-4A.
5. Clear trouble codes then wiggle test the related injector connectors to see if the trouble codes can be induced. If the vehicle had only injector circuit codes for P0202 or P0207 (with bank shutdown P2146 or P2149) and the wiggle test induces a P0202 or P0207 to reset, use bulletin number 05-06-04-047A, repair the injector connectors, and install the injector harness support kit.
6. If the trouble codes or customer concern is induced during the wiggle test on any other cylinders (other then P0202/P0207), replace the effected injector connector pigtail with GMSPO part number 88988963. This replacement pigtail can be used to repair any cylinder except number 2 and number 7. The 2 and 7 cylinder connectors must be repaired and supported as per bulletin 05-06-04-047A.

Note: Dealer technicians are to repair wire chafes at the Fuel Injection Control Module (FICM) as needed. Follow the correct SI wiring repair procedures. Insulate the harness from the aluminum retaining bracket with suitable material (electrical conduit or heater hose) so the harness will not chafe again.

Note: When diagnostics are being completed for Injector Driver Fault codes the dealer technician may notice the Fuel Injection Control Module (FICM) connector is wet or has a wet residue on it. The FICM connectors do have a type of dielectric grease that may be mistaken for diesel fuel. The FICM should not be replaced if this type of wet residue is found. Clean and dry the connectors as needed. No extra dielectric grease needs to be added to the FICM connectors.

Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.