Faulty washer fluid level sensor (internal failure or contamination); Damaged or corroded wiring harness at the sensor connector; Open circuit in the sensor control circuit (broken wire or poor terminal tension); Short to ground or short to power on the sensor signal circuit; Failed body control module (BCM) or sensor control module; Washer fluid reservoir contaminated with debris or incorrect fluid causing sensor malfunction; Loose or disconnected ground connection for the sensor circuit

DTC codes / B01xx · Airbags, seats, doors, lights and comfort systems / B0134

B0134A/V Sensor Washer Fluid F Control Circuit

Q: What does code B0134 mean?

A/V Sensor Washer Fluid F Control Circuit. B0134 indicates that the body control module (BCM) or a dedicated control module has detected a fault in the electrical circuit for the washer fluid level sensor, designated as 'F' in the vehicle's sensor strategy. The computer monitors the signal voltage or current on the sensor's control circuit and flags this code when the reading falls outside the expected range, indicating an open circuit, short to ground, or short to power.

B0134 indicates that the body control module (BCM) or a dedicated control module has detected a fault in the electrical circuit for the washer fluid level sensor, designated as 'F' in the vehicle's sensor strategy. The computer monitors the signal voltage or current on the sensor's control circuit and flags this code when the reading falls outside the expected range, indicating an open circuit, short to ground, or short to power.

SystemBody

Code typeGeneric (all makes)

SeverityLow

Fix difficultyIntermediate

AreaAirbags, seats, doors, lights and comfort systems

Symptoms you may notice

Washer fluid low warning light illuminated on the dashboard even when the reservoir is full
No warning light when the washer fluid level is actually low, leading to unexpected run-out
Intermittent or flickering washer fluid warning light while driving over bumps
Often no symptoms besides the warning light, with no effect on vehicle drivability
Other body control module functions (like wipers or interior lights) may behave erratically if the fault is a shared circuit issue
A stored B0134 code with no driver-visible symptoms at all

Common causes, most likely first

Faulty washer fluid level sensor (internal failure or contamination)
Damaged or corroded wiring harness at the sensor connector
Open circuit in the sensor control circuit (broken wire or poor terminal tension)
Short to ground or short to power on the sensor signal circuit
Failed body control module (BCM) or sensor control module
Washer fluid reservoir contaminated with debris or incorrect fluid causing sensor malfunction
Loose or disconnected ground connection for the sensor circuit

How to diagnose and fix it

Verify the washer fluid level is correct and inspect the reservoir for contamination or debris
Check the sensor connector for corrosion, water intrusion, or loose pins and clean or reseat as needed
Measure resistance across the sensor terminals and compare to specification to confirm sensor failure
Backprobe the sensor control circuit at the BCM to check for open or short circuits with a multimeter
Inspect the wiring harness along its routing for chafing, pinching, or heat damage and repair as necessary
Clear the code and test the circuit with a scan tool to confirm the repair before returning the vehicle
If all circuits and sensor test good, substitute a known-good BCM or reprogram the existing module as a last step

Washer fluid sensor circuit quirks to know

A common misdiagnosis is replacing the washer fluid sensor when the real problem is a corroded connector pin or a chafed wire hidden behind the inner fender liner.
The 'F' designation in the definition often refers to a specific sensor channel on vehicles with multiple washer fluid sensors (e.g., front and rear reservoirs), so confirm which reservoir the code refers to before testing.
Some vehicles use a simple switch-type sensor while others use a variable resistance sensor; testing procedures differ, and using the wrong method can lead to false conclusions.
A weak or failing battery or charging system can cause body control modules to set spurious circuit codes like B0134, so check system voltage before condemning the sensor.
After repairing the circuit, the code may remain stored until several clean drive cycles complete; do not assume the repair failed if the light stays on immediately after clearing.

Can I keep driving with B0134?

The vehicle remains safe to drive because the washer fluid level sensor does not affect engine, braking, or steering systems. You can continue driving, but check the washer fluid level manually at regular intervals until the fault is repaired, as the warning system may be unreliable.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.