C1560

Code

Generic C — Chassis

Brake Pressure Sensor Circuit - Range/Performance

Brand: Generic

Type: C — Chassis

Views: UK: 14 EN: 28 RU: 14

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Failed/failing brake pressure sensor
Damaged wiring harness (short to voltage, short to ground, open circuit)
Corroded or loose connector terminals
Poor sensor reference supply (5 V) or ground
Hydraulic/mechanical fault causing no pressure change (master cylinder, lines, valves)
Faulty ABS/brake control module

Symptoms

ABS warning lamp and/or brake warning lamp illuminated
ABS or traction control may be disabled or operate erratically
ABS activation at inappropriate times or not activating when expected
Inconsistent or spongy brake pedal feel
Diagnostic trouble code stored and possibly freeze frame data

What to check

Connect an OBD-II/scan tool to read C1560 and review freeze frame and live data
Visually inspect sensor, wiring harness and connectors for damage or corrosion
Perform wiggle test on wiring and connectors while monitoring sensor signal
Verify sensor supply (reference) voltage and ground at the connector with key on
Measure sensor output voltage or resistance while applying/releasing brake pressure
Compare sensor readings to manufacturer-specified ranges and to other channels if applicable

Signal parameters

Typical sensor signal: 0.5–4.5 V (proportional to pressure) — varies by manufacturer
Reference supply: 5 V nominal (check for stable supply)
Ground: low resistance to chassis ground (
Output should change smoothly with pedal application; no sudden jumps or dropouts
Expected update rate: continuous analog or periodic 10–100 Hz (manufacturer dependent)

Diagnostic algorithm

Read and record freeze frame, occurrence count and related ABS or CAN codes with a capable scan tool.
Inspect sensor connector and harness for damage, corrosion, bent pins or water ingress; repair as needed.
With ignition on (engine off), backprobe the sensor connector: verify reference (≈5 V), ground continuity and sensor signal voltage.
With a helper apply and release the brake pedal while monitoring live sensor voltage: confirm signal moves smoothly through expected range.
If signal is missing or out of range, measure resistance between sensor signal and ground/5 V per manufacturer procedure; replace sensor if out of spec.
If sensor checks good, trace wiring to ABS/control module; repair open/shorted wires or poor grounds and re-test.
If wiring and sensor are good but the module sees incorrect values, verify module power/ground and communications; consider module fault if all inputs are correct.
After repairs, clear codes and perform road/bench test to confirm the code does not return and ABS functions normally.

Likely causes

Sensor internal fault (drift, intermittent output)
Broken or chafed wires between sensor and module
Connector corrosion or pushed-out pins
Lost 5 V reference or high resistance ground
Contaminated sensor (fluid ingress) or physical damage
Intermittent connector contact from vibration

Fault status

⚠️ Status

Stored when the brake pressure sensor signal is outside expected range or fails to change appropriately with brake application; indicates a sensor, wiring, supply/ground, hydraulic, or module issue.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-3.0 hours