U0320
Software Incompatibility With Power Steering Control Module
Network / module software
Generic OBD-II
Medium
What it means
U0320 means the vehicle has detected that the power steering control module is running software or a calibration that doesn't match the rest of the network. It usually appears after a module is replaced or reflashed. The car stays controllable, but a mismatch can reduce or cut power-steering assist — making the wheel much heavier — until the correct software is loaded.
Medium
Can I keep driving? Drivable but harder to steer — the car stays controllable, but power-steering assist may be lost, making the wheel much heavier especially at low speed and parking; get it fixed promptly.
Common symptoms
What you'll notice
- Power-steering warning light with a U0320 stored, usually right after a module was replaced or reflashed
- Loss or reduction of power-steering assist — heavy steering
- Steering effort worst at low speed and when parking
- Other communication or steering codes may set alongside it
Common causes
Most likely first
- Power steering control module was replaced with one running a different software/calibration version than the vehicle needsLikely
- Interrupted or incomplete software update (reflash) of the moduleCommon
- Wrong part fitted — module part number does not match this vehicle or trimCommon
- Module installed but never programmed/configured with the vehicle's as-built dataLess often
- Software corruption within the moduleLess often
How to diagnose & fix
Work through it in order
- Scan all modules and confirm the code targets the power steering control module; note its software and calibration part numbers.
- Verify the installed module is the correct part number for this VIN.
- Reprogram/reflash the module to the correct current software with an OEM-capable scan tool.
- Complete module configuration (write as-built/VIN data) after flashing.
- If a used or aftermarket module cannot be matched, fit the correct part and program it. Clear codes and confirm all modules report compatible versions.
FAQ
Quick answers
Is it safe to drive with U0320?+
The car remains steerable, but you may lose power assist, so the wheel becomes much heavier — most noticeable when parking or turning slowly. Drive with extra care and get it corrected soon.
Can I just clear U0320?+
Clearing it won't help — the software versions still don't match, so the code returns and the assist stays affected. The module has to be flashed to the correct, compatible software.
Related codes
Often seen with U0320
Read & clear U0320 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX