For 1990-2009 cars

# Some Tech 2 Special Functions May Not Work When Related DTCs are Stored - keywords actuator camshaft control ECM EGR EVAP inoperative intake no output P0400 P0401 P0403 P0404 P0440 P0441 P0442 P0446

Subject: | Some Tech 2 Special Functions May Not Work When Related DTCs are Stored

Models: | 1996-2001 Chevrolet Metro

| 1996-2002 Chevrolet Prizm

| 1996-2004 Chevrolet Tracker

| 2003-2005 Pontiac Vibe

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

### Condition/Concern:

The PCM may inhibit Tech 2 control of EGR, EVAP, and Camshaft Actuator Solenoids if any of the following DTCS are stored: P0400, P0401, P0403, P0404, P0440, P0441, P0442, P0446, P0455, P0456, P1346, or P1349.

### Recommendation/Instructions:

If this condition is encountered and the diagnostics lead to PCM replacement, clear all of the DTCs, and perform the diagnostics again because the PCM may be inhibiting solenoid control as a result of the DTCs.

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.