U0236 code meaning
Lost Communication With Column Lock Module
What U0236 means
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.
U0236 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyHard
- Typical labor0.5 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U0236
- Steering lock or service steering column warning
- Engine does not crank or start
- Steering wheel stays locked
Common causes of U0236
- Most likelyColumn lock module without power or ground (fuse, connector at column)
- PossibleHarness at the steering column chafed or plug loose after column work
- PossibleElectric column lock unit faulty
- Less likelyLow battery voltage during start request
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Column lock moduleCAN bus wiring
What each part of U0236 means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 36 | The exact fault in that area. |
What to do next
- Note U0236 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 U0236
What does U0236 mean?
U0236 means "Lost Communication With Column Lock Module". U0236 reports that the column lock module, which electrically bolts and frees the steering shaft as theft protection, has stopped communicating. It is a generic code, so it means the same on every make.
Is it safe to drive with U0236?
U0236 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will U0236 fail an emissions test?
U0236 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 U0236 to fix?
Difficulty: hard. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will U0236 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.