Question about 2003 Chevrolet Monte Carlo
Before guessing at transmission problems, check the fluid level (car warmed up, engine running in Park on level ground) and have the PCM scanned for trouble codes FIRST.
Soft shifting, gradual performance degradation: Poor line pressure rise due to leaking boost valve, clogged EPC filter screen, failing EPC solenoid, or worst case: leaky seals throughout.
Check TPS for smooth and linear electrical response over the entire range of motion. If not, replace. Also replace the boost valve and EPC filter screen and worst, replace the EPC valve when you service the transmission.
Thank you for using fixya and Try not to run or drive the car to hard or further damage could result.
Posted on May 10, 2010
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Posted on Jan 02, 2017
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