A faulty transmission control module (TCM) most often causes limp mode with the gearbox stuck in one gear, harsh jolts when you select D or R, erratic gear changes, flashing PRND letters and a gearbox or engine warning light. However, the same symptoms are often caused by a low gearbox oil level, a weak battery, a poor earth or a faulty sensor. To test a transmission control module, start by checking the battery and reading the fault codes with a diagnostic tool that can talk to the gearbox control unit, then check the power supply, the connector, the oil and the live data. Below we explain the symptoms, the diagnostic steps and what the most common fault codes mean.
ABS pump and control module Jeep 68207920AF
Vendors's code: 68207920AF
Product code: abs_68207920AF
Barcode:
Code 39:
ISBN:
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ABS light on after a downpour - compare 68207920AF with your part
Used, working, genuine ABS unit for Jeep. One part number (OEM). We do not state the model - selection by part number.
ABS pump with module for Jeep - 68207920AF
An ABS light that comes on after heavy rain or an engine wash often points to moisture in the connectors. Sometimes, however, water gets in deeper and damages the module. Then the only option is to replace the unit. This listing is for a used, working and genuine unit for Jeep. It has one part number (OEM).
Unit number
- 68207920AF - part number (OEM): 68207920AF
The number ends with the letters AF. Compare it including these letters. The label on a part that has been exposed to moisture may have come unstuck or be smudged. In that case, look for a print on the housing. We do not assign the pump or control module role to the number.
Signs of moisture
What mechanics look out for:
- deposits or corrosion on the module connector contacts,
- the ABS warning light after driving in a downpour,
- a fault that disappears once the car has dried out,
- a permanent module fault after water ingress.
Disconnect the battery and inspect the module connector. Clean the contacts with electrical contact cleaner. Check that the connector seal is intact. If the fault persists even when the car is dry, compare the number. After fitting, bleed the system and ask about coding.
Questions and doubts
| Can cleaning the connector be enough? |
|---|
| Sometimes, yes. That is why you should do it before buying a unit. |
| Are the letters AF part of the number? |
| Yes. Compare 68207920AF in full. |
| Which model is this unit for? |
| We do not state the model. Selection is by part number. |
| What if the number is illegible? |
| Send us a photo. We will try to read it and compare it. |
Read the number from the housing and get in touch. We will compare it with the listing.