C1335 — ABS Inlet Valve Coil RF Circuit Excessive Temperature

OBD2 code C1335 flags a problem with the ignition system (C1335 — ABS inlet valve coil RF circuit excessive temperature: causes, symptoms & fix). Short, gentle driving to a shop is usually possible. Common culprits: faulty ignition control circuit in the ECM, moisture or oil in the spark plug wells, worn spark plugs or wrong plug gap.

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Is it safe to drive?

Drive with caution Drive with caution and avoid load. Ignition faults cause misfires that quickly overheat and destroy the catalytic converter; if the Check Engine Light flashes, stop and fix it first.

How to diagnose with an OBD scanner

Read the code and freeze frame Connect an OBD2 scanner, confirm C1335 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 ignition system for damage, corrosion, chafing or poor contact.
Subsystem check Swap the coil to another cylinder and see if the fault code follows it.
Subsystem check Inspect spark plugs for wear, oil or carbon tracks and check plug gaps.
Verify the repair Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm C1335 does not return.

Approximate repair cost

Repair cost depends on which component actually failed. Typical scenarios for C1335 (parts and labor, USD, independent shop rates): Replace an ignition coil: $150–$380; Replace spark plugs: $90–$250; Repair coil wiring or connector: $80–$250. Overall, fixing C1335 usually costs between $80 and $380. 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 C1335 myself?

Start with a scan: confirm C1335, save the freeze frame and note any companion codes. Then inspect the wiring and connectors related to the ignition system, and verify the suspect component against live data before buying parts.

How much does it cost to fix C1335?

Replace an ignition coil — $150–$380; Replace spark plugs — $90–$250; Repair coil wiring or connector — $80–$250. Exact cost depends on the root cause, your vehicle and local labor rates — a proper diagnosis is the cheapest first step.

What are the symptoms of C1335?

Drivers most often notice: loss of power and jerking, misfires under load or at idle, hard starting, especially in damp weather, Check Engine Light on.

What is the most common cause of C1335?

The most common causes are: faulty ignition control circuit in the ECM, moisture or oil in the spark plug wells, worn spark plugs or wrong plug gap.

Is it safe to drive with C1335?

Drive with caution and avoid load. Ignition faults cause misfires that quickly overheat and destroy the catalytic converter; if the Check Engine Light flashes, stop and fix it first.

C1335 — C1335 — ABS Inlet Valve Coil RF Circuit Excessive Temperature: Causes, Symptoms & Fix

When your vehicle's computer sets code C1335, it has detected that the right-front ABS inlet valve coil is running hotter than its design limit allows. The anti-lock braking system relies on a network of inlet valves to modulate brake pressure at each wheel independently. Each valve has an electromagnetic coil that the ABS control unit commands open and closed many times per second during a stop. If that coil overheats, it can no longer respond accurately, and the system stores C1335.

The ABS module constantly monitors electrical resistance and temperature in each valve circuit. When the inlet valve coil on the right-front wheel exceeds safe temperature thresholds for the programmed number of consecutive drive cycles, the ECU confirms a genuine fault rather than a transient spike and lights the ABS warning lamp. It also captures freeze frame data showing vehicle speed, brake pressure, and electrical values the moment the fault triggered, which points you toward the conditions most likely to reproduce the problem.

C1335 specifically affects the right-front wheel's inlet valve coil circuit. You may not feel anything wrong during normal street driving, but once you need hard braking or encounter a situation where the ABS activates, the system may fail to modulate pressure correctly on that corner, increasing stopping distance and reducing stability control effectiveness.

Common Symptoms of C1335

ABS warning lamp stays illuminated on the dashboard
Anti-lock braking fails to activate during panic stops; wheels lock up
Traction control or stability control warning lights accompany the ABS lamp
Braking feels normal in normal conditions but ABS does not engage when needed
Unusual noise from the ABS pump when the system attempts to activate
Intermittent ABS operation that worsens under sustained braking or high temperatures

What Causes C1335?

The right-front inlet valve coil overheats for a handful of reasons. Begin with the most frequent before moving to less common culprits.

Excessive current draw through the inlet valve coil due to a shorted or grounded wire harness
Corrosion or moisture intrusion at the ABS valve electrical connector causing resistance and heat buildup
Failed solenoid within the ABS hydraulic unit itself; the coil overheats because it works harder against increased load
Faulty ABS control module sending incorrect commands that overdrive the inlet valve
Aftermarket brake modifications or incompatible ABS components creating electrical mismatch
Prolonged aggressive driving that keeps the ABS pump cycling, raising overall system temperature

How to Diagnose C1335

Systematic diagnosis prevents unnecessary parts replacement and ensures you address the true root cause of C1335.

Connect a professional OBD2 scanner, retrieve C1335, and record all stored freeze frame data. Note the vehicle speed, brake application status, and battery voltage recorded when the fault first appeared.
Scan for any related ABS codes. Codes in the C1300 range frequently occur together and can point to a shared problem in the hydraulic unit, wiring, or module. Check manufacturer TSBs for your specific make and model using your VIN at the manufacturer website or nhtsa.gov.
Perform a visual inspection of the wiring harness near the right-front wheel well and the ABS pump connections in the engine bay. Look for chafed insulation, corroded pins, loose connectors, and any signs of moisture or oil contamination.
Measure electrical resistance at the right-front inlet valve coil connector using a multimeter. Compare your reading to factory specifications. Out-of-spec resistance indicates a failing coil inside the hydraulic unit.
If equipment allows, command the inlet valve solenoid active and monitor current draw. A coil drawing excessive amperage confirms the internal solenoid is failing.
Clear the code and perform a controlled test drive that reproduces the freeze frame conditions—hard braking from speed if possible. If C1335 returns, the issue lies within the hydraulic unit or its internal wiring.

Repair Options and Cost

Correcting C1335 usually means addressing either the wiring or the hydraulic assembly itself.

Replace the inlet valve coil or entire ABS hydraulic unit (most common fix): $280–$550 parts and labor
Repair damaged wiring harness or replace the affected connector: $100–$225 parts and labor
Replace the ABS control module if diagnostics point to a faulty module sending incorrect commands: $200–$450 parts and labor

Total Repair Cost for C1335

For most vehicles, expect to spend between $100 and $550 depending on which component actually failed. The cheapest scenario is a damaged connector or shorted wire, while a failed hydraulic unit with integrated solenoids lands at the higher end. Because diagnosis determines which repair you actually need, an accurate pre-repair inspection saves money compared to guessing and replacing parts unnecessarily.

Can You Drive with C1335?

Drive with caution. Your regular brakes work fine without ABS intervention, but in situations requiring maximum stopping power—panic stops, slippery surfaces, emergency maneuvers—the anti-lock function will not operate on the right-front wheel. This reduces vehicle stability and extends stopping distance. If the ABS lamp is flashing rather than solid, have the vehicle serviced immediately before any further driving.