Intermittent SES Light Due To DTCs P060E P2135 And/Or P2138 - keywords chaff circuit connection controls ECM engine ground L61 LE5 low message no PCM power short terminal wire wiring

This PI was superseded to update models. Please discard

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

On rare occasions, an intermittent SES light may be experienced due to DTCs P2135 and/or P2138. In some instances, a P060E may also be stored as a result of either DTC.

If any of the DTCs are setting consistently, perform the SI diagnostics and repair as necessary. If the SI diagnostics do not isolate the concern, perform the following suggestions as necessary:

1. For P2138 DTCs, review bulletin 07-06-04-019 and inspect corrosion or water intrusion in C201. Also inspect for a poor connection or poor terminal tension on the APP circuits while this connector is disconnected.
2. Inspect the engine harness for potential shorts to ground in the following locations, and repair and reposition the circuits/harness as necessary:

•	at the air conditioning line about 3-6 inches from the ECM connectors.

•	on the ECM case and/or on the edge of either ECM connector body.

•	at the air conditioning line above the transmission.

•	at the edge of the aluminum oil filter housing on the engine block.

•	at the UBEC bracket.

•	at the EVAP purge valve bracket.

•	at the rear of the cylinder head/upper edge of transmission bellhousing.

3. Inspect all of the APP (P2138) or TP (P2135) circuits to determine if duraseal splice sleeves or a service pigtail was used during previous repairs. If so, the incorrect crimp tools may have been used to install the splice sleeves, and this could induce an intermittent concern. If the incorrect tools were used, or if it's unknown what tools were used to install the splice sleeves, replace the splice sleeves again by using the correct tools and following the "Splicing Copper Wire Using Splice Sleeves" Procedure in SI.
4. Inspect all of the APP (P2138) or TP (P2135) circuits for poor terminal tension using test probe J-35616-2A on the APP/TP sensor terminals and J35616-64B on the ECM/PCM terminals. Also, inspect all of these circuits for high resistance or possible shorts to ground while wiggling the harness around. And, also inspect the connector face to ensure that none of the terminals have backed out and that the connector face cover is latched into position properly. If the connector face cover is not latched to the connector, it may become unfastened and stick in the sensor, preventing the connector from seating properly once the connector is plugged into the sensor. If any concerns are found, repair as necessary by following SI procedures.
5. If there is no problem found above, please contact BQM, Wayne Zigler, to review further direction. His office phone number is 586-492-6261 and his cell phone number is 586-596-9982. If Wayne is not available, please leave him a voice mail that includes the following information and he will return your call within 1 business day:

•

Your Name

•	Your Phone Number

•	Last 8 Digits of the VIN Number

•	TAC Case Number If Applicable

•	Stored 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.