C 1500 Truck 2WD V6-4.3L VIN X (2003)
PROM - Programmable Read Only Memory: All Technical Service Bulletins
A/T - No Start/MIL ON/DTC P0706/Indicator Inaccurate
Bulletin No.: 04-07-30-029
Date: June 30, 2004
TECHNICAL
Subject:
Service Engine Soon (SES) Light On, Diagnostic Trouble Code (DTC) P0706, Gear Range Indicator Incorrect/Inaccurate, No Start (Reprogram
Powertrain Control Module (PCM))
Models:
2003 Chevrolet and GMC Light Duty Trucks
with 4L80-E Automatic Transmission (RPO MT1) or 4L85-E Automatic Transmission (RPO MN8)
Condition
Some customers may comment that the SES light is on. Some may comment that the vehicle will not start. Others may comment that the gear range
indicator always reads "2" or "D2" regardless of the actual gear the transmission is in.
Cause
The original PCM diagnostic for DTC P0706 defaults the transmission position to Drive Range "2" when P0706 is set relating to the transmission range
select circuit.
Correction
Follow the diagnostic tips and service procedure below to correct this condition.
Diagnostic Tips
^
When DTC P0706 sets, the vehicle will not start.
^
For additional information on DTC P0706, refer to SI Document.
^
Check for proper operation and adjustment of the Park Neutral Position (PNP) switch. Refer to Park/Neutral Position Switch Adjustment.
^
Check for proper operation and adjustment of the Range Selector Cable. Refer to Automatic Transmission Range Selector Cable Adjustment.
^
Check for proper electrical connections and terminal integrity.
^
Inspect ground G103.
^
Check to determine if the PCM calibration has been previously updated to a calibration to include the update for throttle body coking. If the PCM
currently has this coking calibration, it is not necessary to reprogram the PCM again.
Repair Procedure
1.
Diagnose and repair the cause of P0706.
