C1464 — Pressure Transducer Redundant / Secondary Signal Faulted #

Note: The code description may vary depending on the vehicle manufacturer.

• C1464 – Pressure Transducer Redundant Sensor Circuit Malfunction (Toyota/Lexus)
• C1464 – Pressure Sensor 2 Circuit Failure (Ford)
• C1464 – Secondary Pressure Transducer Signal Fault (Chrysler/Jeep)
• C1464 – Pressure Sensor Redundancy Error (General Motors)

Summary of the C1464 Code #

The C1464 code indicates an issue with the redundant or secondary pressure transducer signal in your vehicle’s system, typically associated with brake pressure sensors or hydraulic control units. The pressure transducer is a sensor that converts fluid pressure into an electrical signal, providing crucial feedback to the vehicle’s electronic control unit (ECU). Redundant or secondary signals are used to double-check the accuracy of the main sensor, ensuring safe operation. When the control module detects a discrepancy, loss, or implausible signal from this secondary circuit, it triggers C1464. While not always an immediate safety risk, ignoring this code can lead to compromised system performance, so timely diagnosis is essential.

Common Symptoms for Code C1464 #

A fault in the redundant or secondary pressure transducer circuit typically triggers warning lights and may impact the behavior of safety systems. Drivers and technicians may notice:

• ABS warning light illuminated on the dashboard
• Brake warning light may also be on
• Traction control/stability control light may activate
• Possible loss or reduction of ABS/traction control function
• Brake pedal may feel stiffer than usual
• Unusual system noises during braking

Probable Causes for C1464 #

This DTC can result from several issues, most commonly electrical faults or sensor failure. Based on frequency, probable causes include:

1. Faulty secondary pressure transducer (sensor)
2. Open, short, or corroded wiring/connectors in the sensor circuit
3. Faulty hydraulic control unit (HCU) or ABS module
4. Poor ground or power supply to the sensor
5. Moisture or contamination in the sensor or wiring harness

Step-by-Step Diagnosis for C1464 #

A systematic approach will help pinpoint the exact fault. Always observe proper safety measures when working with brake or ABS components.

• Step 1: Connect a scan tool capable of reading ABS codes and verify the presence of C1464. Check for related codes.
• Step 2: Inspect the brake pressure sensor wiring and connectors visually for corrosion, loose pins, or damage.
• Step 3: Using a wiring diagram, measure voltage and continuity between the secondary sensor and the control module.
• Step 4: Compare live data values from the primary and redundant sensors (if available) for outliers.
• Step 5: Test the secondary pressure sensor with a multimeter or substitute with a known good sensor if possible.
• Step 6: If wiring and sensors are good, consider testing or replacing the ABS module/HCU as advised by the OEM.
• Step 7: Clear the code and road test the vehicle to confirm the repair.

Possible Repairs for C1464 #

Once the root cause is identified, the following repairs are most common for resolving this DTC:

• Replace faulty secondary pressure transducer (sensor)
• Repair or replace damaged wiring/connectors in the sensor circuit
• Clean sensor connectors and apply dielectric grease to prevent future corrosion
• Replace or reprogram the hydraulic control unit (HCU) or ABS module if internal failure is confirmed
• Address moisture intrusion or contamination issues in the affected area

Is It Safe to Drive with Code C1464? #

Driving with code C1464 is generally not recommended. While the vehicle may still operate, the associated warning lights mean critical brake safety features such as ABS or traction control may not function properly. This can increase stopping distances, especially on slippery surfaces, and compromise overall safety. Have the system inspected and repaired as soon as possible.

Vehicles Most Commonly Affected by C1464 #

This code appears most often in vehicles where electronic brake and stability control systems rely on dual pressure sensors for redundancy. Manufacturers with higher incidence include:

• Toyota and Lexus (various models with advanced ABS/ESC)
• Ford (especially Fusion, Escape, and F-series trucks)
• Chrysler, Jeep, Dodge (with advanced brake modules)
• General Motors (Chevrolet, GMC SUVs and trucks)

Common Mistakes & Best Practices with C1464 #

C1464 can lead to misdiagnosis if troubleshooting is rushed or incomplete. Avoid these pitfalls and follow best practices:

• Do not replace the pressure sensor until wiring has been thoroughly checked
• Always use an OEM-quality sensor for replacement—aftermarket units may not resolve the issue
• Clean and protect connectors to prevent recurring faults
• Follow the OEM’s diagnostic flowchart for your specific vehicle
• Double-check for related codes that might affect diagnosis

Express FAQ for C1464 #

Here are answers to the most common questions about this code:

• Q: Can I reset the C1464 code and ignore it if the car seems fine?
  A: No, clearing the code does not fix the underlying issue. The warning will likely return, and you risk losing critical safety functions.
• Q: Does a faulty secondary pressure sensor mean my brakes will fail?
  A: Not directly, but your vehicle may lose ABS or stability control support, increasing the risk of wheel lock-up or skidding in emergencies.