U1726
Right Headlamp High Beam Control Module Lost Communication With Right Headlamp Low Beam Control Module
U1726 is an OBD-II diagnostic trouble code meaning: Right Headlamp High Beam Control Module Lost Communication With Right Headlamp Low Beam Control Module. Common causes: broken or damaged wires between modules, low beam control module malfunction. Estimated repair cost: $33–167.
Symptoms
- Incorrect operation of the right headlight
- Lights flickering or turning off
- Error message on the dashboard
- Uneven lighting on the right
- No switching between low and high beam
Causes
- Broken or damaged wires between modules
- Low beam control module malfunction
- Problems with the high beam control module
- Contact corrosion
- Problems with module power supply
How to Fix
- Check the integrity of the wiring harness between the modules
- Inspect and clean connector contacts
- Check power and ground on both modules
- Test the modules on another car (if possible)
- Replace the faulty module
Related codes
FAQ
What does the U1726 code mean?
U1726 is an OBD-II diagnostic trouble code that indicates: Right Headlamp High Beam Control Module Lost Communication With Right Headlamp Low Beam Control Module
What causes a U1726 error code?
The most common causes of U1726 include: Broken or damaged wires between modules; Low beam control module malfunction; Problems with the high beam control module; Contact corrosion.
How do I fix a U1726 diagnostic trouble code?
To fix U1726: Check the integrity of the wiring harness between the modules. Inspect and clean connector contacts. Check power and ground on both modules. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U1726?
Do not drive — repair immediately
How much does it cost to fix U1726?
The estimated repair cost for U1726 is $33–167. Actual cost depends on your vehicle, location, and labor rates.
See also: Russian version · NationStat