C1464 — Pressure Transducer Redundant / Secondary Signal Faulted

C1464 — Pressure Transducer Redundant / Secondary Signal Faulted. A fault in the sensor and actuator circuits. The car is usually drivable while you plan the repair. Typical causes: open or shorted wiring in the circuit, faulty sensor or actuator of the affected circuit, control module driver fault.

chassis (brakes/steering/suspension)

Is it safe to drive?

Short-term driving is OK In most cases the car remains drivable, possibly with reduced performance or a disabled auxiliary system. If symptoms include stalling, no-start or brake/steering warnings, treat it as urgent.

How to diagnose with an OBD scanner

Read the code and freeze frame Connect an OBD2 scanner, confirm C1464 is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
Check for companion codes and TSBs Related codes often reveal the real root cause. Also check manufacturer technical service bulletins (TSB) for your make and model — many C0xxx issues have factory fixes or software updates. Search by VIN on the manufacturer site or nhtsa.gov.
Inspect wiring and connectors Visually inspect the wiring harness and connectors related to the pressure transducer redundant / secondary signal faulted for damage, corrosion, chafing or poor contact.
Subsystem check Measure reference voltage, ground and signal continuity at the component connector.
Subsystem check Wiggle-test the harness while watching the signal in live data — dropouts reveal broken wires.
Verify the repair Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm C1464 does not return.

Approximate repair cost

Repair cost depends on which component actually failed. Typical scenarios for C1464 (parts and labor, USD, independent shop rates): Control module repair: $300–$1,000; Replace the faulty sensor or actuator: $150–$500; Repair wiring or connectors: $80–$250. Overall, fixing C1464 usually costs between $80 and $1,000. An accurate diagnosis before buying parts saves money — the most expensive scenario is rarely the first one to check.

Common questions

How do I diagnose C1464 myself?

Start with a scan: confirm C1464, save the freeze frame and note any companion codes. Then inspect the wiring and connectors related to the sensor and actuator circuits, and verify the suspect component against live data before buying parts.

What does OBD2 code C1464 mean?

What are the symptoms of C1464?

Drivers most often notice: possible limp mode depending on the affected component, the affected system operates intermittently or not at all, increased fuel consumption in some cases, Check Engine Light on.

What is the most common cause of C1464?

The most common causes are: open or shorted wiring in the circuit, faulty sensor or actuator of the affected circuit, control module driver fault.

How much does it cost to fix C1464?

Control module repair — $300–$1,000; Replace the faulty sensor or actuator — $150–$500; Repair wiring or connectors — $80–$250. Exact cost depends on the root cause, your vehicle and local labor rates — a proper diagnosis is the cheapest first step.

When your scan tool pulls a C1464, the vehicle's control unit is reporting that a pressure transducer's redundant or secondary signal has fallen outside its acceptable operating range. This code lives in the chassis category, which covers braking, steering, and suspension systems rather than the engine itself. The module constantly watches this signal while you drive, and when it strays from factory specifications for longer than the calibration allows, C1464 gets stored and the warning light illuminates.

The pressure transducer in question typically works alongside another sensor to provide the control system with a backup reading — redundancy is built in for safety-critical functions. When both channels should agree but one doesn't, the ECU flags the discrepancy and defaults to a failsafe mode. The freeze frame data saved with C1464 captures the exact driving conditions at the moment of failure: engine speed, load, temperature, and vehicle speed. That snapshot gives you the best starting point for diagnosis because it tells you exactly what the car was doing when the fault occurred.

Common Symptoms of C1464

The Check Engine light or a chassis-specific warning lamp activates on the dashboard
The vehicle may enter limp-home mode, limiting power or specific system functions depending on which component is affected
The related system operates intermittently or stops working altogether
Some drivers notice increased fuel consumption when the engine management system compensates for the fault
Reduced performance in the affected subsystem — such as stability control or power steering assist — depending on the vehicle

What Causes C1464?

A faulty or internally failed control module driver responsible for reading the transducer signal
A weak or interrupted ground connection at the sensor or control unit
Corrosion, moisture intrusion, or physical damage at the electrical connector
Broken, frayed, or pinched wiring creating an open or shorted circuit
A blown fuse that interrupts power to the affected sensor or its reference voltage circuit

How to Diagnose C1464

Plug in an OBD2 scanner, confirm C1464 is present in the stored codes, and record the freeze frame data — this shows engine speed, load, coolant temperature, and vehicle speed when the fault triggered.
Check for any other diagnostic trouble codes alongside C1464. Related codes often point to the underlying issue rather than the secondary signal fault itself.
Pull up manufacturer technical service bulletins for your specific make and model — some C-series codes have published factory fixes, calibration updates, or known component issues.
Perform a visual inspection of the wiring harness and connectors associated with the pressure transducer. Look for damaged insulation, corrosion, bent pins, or loose connections.
Use a multimeter to check reference voltage, ground integrity, and signal continuity at the component connector while monitoring live data on the scanner.
Clear the code, then drive the vehicle through a complete drive cycle that replicates the freeze frame conditions. If C1464 returns, the fault is confirmed and persistent.

Repair Options for C1464

The right fix depends on what's actually broken. Work through the least expensive possibilities before replacing major components.

Wiring or connector repair: $80–$250. Cleaning corrosion, soldering broken wires, or replacing a damaged connector often resolves the issue at the lowest cost.
Faulty sensor or actuator replacement: $150–$500. If testing confirms the transducer itself has failed, installation of a new or remanufactured unit restores proper operation.
Control module repair or replacement: $300–$1,000. When the module's internal circuitry has failed, repair by a specialist or full replacement may be necessary.

How Much Does It Cost to Fix C1464?

Repair costs for C1464 span a wide range because multiple components could be responsible. At an independent shop using standard labor rates, here is what you can expect for common repair scenarios:

Wiring or connector repair typically runs $80–$250 depending on accessibility and whether connectors need replacing.
Sensor or actuator replacement generally costs $150–$500 depending on the part price and labor time for your specific vehicle.
Control module work can reach $300–$1,000, especially if the unit requires programming or replacement rather than a simple repair.

In practice, most C1464 repairs fall between $80 and $1,000 total. Doing thorough electrical diagnosis before purchasing parts prevents spending $500 on a new sensor when the real problem was a corroded connector.

Can You Drive with C1464?

C1464 carries a short-term severity rating. In most cases the vehicle remains drivable, though you may experience reduced performance, limited power, or a disabled auxiliary system depending on which subsystem is affected. If the car shows stalling, hard starting, or warnings related to braking or steering, treat the situation as urgent and have it diagnosed immediately.