Cadillac P1600: TCM Internal Watchdog Operation (4L60-E)
Is your scanner showing Cadillac P1600?
No worries. We'll show you what it means and how to deal with it.
Cadillac P1600: TCM Internal Watchdog Operation (4L60-E)
OVERVIEWWhat Does The Cadillac P1600 Code Mean?
Key on or engine running; TCM High side driver open, and the PCM received a signal that indicated the TCM detected an unexpected voltage condition on the internal TCM Power Control relay.
What Are The Potential Causes Of The Cadillac P1600 Code?
- Power control relay circuit is open, shorted to ground or to B+
- Power control relay is damaged or has failed
- TCM has failed
Recommended Parts
Below are some recommended auto parts to help you address the trouble code affecting your vehicle and get it running smoothly again:
>>> INNOVA 5210
>>> GM Genuine Parts 12633238 Engine Control Module
Note: During the purchasing process, please check carefully whether the part you want to buy fits your car!
