U0437 code meaning
Invalid Data Received From Differential Control Module - Rear
What U0437 means
The rear differential control module runs an electronic limited-slip differential or the rear clutch of an on-demand all-wheel drive. U0437 is set when a receiver gets its frames but finds torque, clutch state or counter values invalid. No manufacturer documents U0437 publicly with thresholds. GM bulletins show how the module is organised: PI1074B links a Service All Wheel Drive message with U0136 in the brake module of 2014 Enclave, Traverse and Acadia AWD to the software of the K47 rear differential module, whereas on 2020 CT5 and Corvette the eLSD logic runs inside the brake controller (20-NA-217) and no separate module exists. Jeep's 2013-14 Grand Cherokee has its own ELSD module (21-001-14). Typical result: AWD or eLSD switched off and a service message. U0136 is lost contact.
U0437 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modePossible
- Repair difficultyWorkshop only
- Typical labor0.3 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U0437
- Service AWD or rear axle message
- All-wheel drive or limited-slip function inactive
Common causes of U0437
- Most likelyRear differential module software needs reprogramming
- PossibleCorrosion at the module mounted on or near the rear axle
- Less likelyFaulty clutch actuator or motor feeding implausible status
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Rear differential module
What each part of U0437 means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 37 | The exact fault in that area. |
What to do next
- Note U0437 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about U0437
What does U0437 mean?
U0437 means "Invalid Data Received From Differential Control Module - Rear". The rear differential control module runs an electronic limited-slip differential or the rear clutch of an on-demand all-wheel drive. It is a generic code, so it means the same on every make.
Is it safe to drive with U0437?
Drive gently and only to a workshop. With U0437 the car can go into limp mode (reduced power) to protect itself.
Will U0437 fail an emissions test?
U0437 is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is U0437 to fix?
Difficulty: workshop only. A typical repair takes 0.3 to 3 hours of work. This is a job for a workshop.
Will U0437 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.