Code
C1297
LAND ROVER
C — Chassis
ABS hydraulic pressure sensor circuit fault
Views:
UK: 13
EN: 30
RU: 17
AI status
Completed
Completed
100%
Causes
- Damaged or failed ABS hydraulic pressure sensor
- Open, shorted or corroded wiring or connectors between sensor and ABS module
- Poor or missing sensor ground or reference supply (fuse, relay, wiring)
- Water ingress, contamination or physical damage to sensor or harness
- Faulty ABS hydraulic unit / pressure sensor integrated in modulator
- ABS control module internal fault or software/communication error
Symptoms
- ABS warning lamp illuminated (and possibly DSC/traction control lamp)
- ABS/ESC functions may be disabled or limited
- Brake pedal feel may change under heavy braking (reduced ABS intervention)
- Diagnostic trouble codes stored and live pressure sensor data abnormal or missing
- In some cases brake assist or stability control warnings
What to check
- Read stored and pending codes plus freeze frame data with a qualified scan tool; note related ABS/ESC codes
- Visually inspect wiring harness, connector and sensor for damage, corrosion, fluid contamination or loose pins
- Check fuses and relays supplying ABS/ESC module and sensor reference power
- Using a multimeter/oscilloscope check sensor reference voltage, ground continuity and signal voltage at the connector with ignition ON (do not short pins)
- Monitor live data from the ABS pressure sensor while operating the brake pedal or using a pressure tester to confirm plausibility
- Perform wiggle test on harness while watching live data or DTC status to look for intermittent faults
Signal parameters
- Reference supply: typically 5 V reference (confirm with OEM data)
- Signal output: typically 0.5–4.5 V proportional to hydraulic pressure (0 V or stuck high indicates fault)
- Expected behavior: signal should change smoothly with brake pedal pressure; no sudden dropouts or spikes
- Resistance/continuity: wiring to module should show near 0 Ω to ground/return pins and proper resistance between signal and reference per OEM spec (check service manual)
Diagnostic algorithm
- Retrieve all ABS/ESC DTCs and freeze frame data. Record before clearing codes.
- Visually inspect sensor, connector and harness for damage, corrosion, water ingress or contamination. Repair as needed.
- With connector disconnected, check for correct reference voltage and ground at the harness connector (refer to OEM spec).
- Back-probe signal wire and monitor live voltage while an assistant applies the brake pedal; verify signal varies smoothly within expected voltage range. Note any dropouts or fixed readings.
- Perform continuity checks: sensor connector to ABS module pins, and check for short to battery positive or ground.
- If wiring and supply are OK, bench-test or replace the hydraulic pressure sensor (or replace the ABS hydraulic unit if sensor is integrated) and clear codes.
- After replacement, recheck live data, erase codes and conduct road test including ABS activations if safe to do so (brake test on low-traction surface or per service procedure).
- If new sensor does not correct the issue and wiring is good, evaluate ABS control module functionality, grounds and internal faults — consult OEM module diagnostics and consider module replacement or reprogramming.
- Follow OEM procedures for any hydraulic bleeding or system initialization steps after repairs if required.
Likely causes
- Corroded connector pins at the hydraulic pressure sensor
- Broken/shorted wiring in harness near suspension/engine harness grommet
- Failed hydraulic pressure sensor (internal element)
- Fault in ABS modulator when sensor is integrated into assembly
Fault status
Status
ABS hydraulic pressure sensor circuit fault — ABS/ESC control module detecting invalid, missing or out-of-range hydraulic pressure sensor signal; ABS/traction may be disabled.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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