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U0236 Lost Communication With Column Lock Module

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

U0236 reports that the column lock module, which electrically bolts and frees the steering shaft as theft protection, has stopped communicating. It has nothing to do with the steering angle sensor (U0126). GM bulletin 20-NA-114 for 2020-2021 Cadillac CT4, CT5 and Escalade, Chevrolet Tahoe and Suburban, GMC Yukon and export Corvette with electric column lock (RPO N06) states that U0212 stored by the cluster, body module or gateway is mis-mapped there and has the technician diagnose U0236 instead. Saab's 2011 U-code list names the slot Steering Column Lock Module. Since the start system usually waits for confirmation that the lock has released, a mute lock module can bring a steering lock warning or a refusal to start. U0537 covers invalid lock data; no MIL documented.

Likely causes

Column lock module without power or ground (fuse, connector at column)
Harness at the steering column chafed or plug loose after column work
Electric column lock unit faulty
Low battery voltage during start request

Symptoms

  • Steering lock or service steering column warning
  • Engine does not crank or start
  • Steering wheel stays locked

Repair estimate

DifficultyHardWorkshop job
Parts and labour€50–1,200
Time0.5–3 h

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

Parts involved

column lock modulecan bus wiring

Related codes

U0537U0212U0126

References: static.nhtsa.gov, static.nhtsa.gov, saabwisonline.com, en.wikipedia.org.