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U0437 Invalid Data Received From Differential Control Module - Rear

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

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.

Likely causes

Rear differential module software needs reprogramming
Corrosion at the module mounted on or near the rear axle
Faulty clutch actuator or motor feeding implausible status

Symptoms

  • Service AWD or rear axle message
  • All-wheel drive or limited-slip function inactive

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€50–1,300
Time0.3–3 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

rear differential module

Related codes

U0136U0436U0135

References: static.nhtsa.gov, static.nhtsa.gov, static.nhtsa.gov.