C1336 — ABS Inlet Valve Coil RR Circuit Excessive Temperature

C1336 — C1336 — ABS Inlet Valve Coil RR Circuit Excessive Temperature: Causes, Symptoms & Fix. A fault in the ignition system. Short, gentle driving to a shop is usually possible. Typical causes: moisture or oil in the spark plug wells, damaged coil wiring or connector, worn spark plugs or wrong plug gap.

vehicle

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

  1. Read the code and freeze frame Connect an OBD2 scanner, confirm C1336 is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
  2. 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.
  3. Inspect wiring and connectors Visually inspect the wiring harness and connectors related to the ignition system for damage, corrosion, chafing or poor contact.
  4. Subsystem check Swap the coil to another cylinder and see if the fault code follows it.
  5. Subsystem check Inspect spark plugs for wear, oil or carbon tracks and check plug gaps.
  6. Verify the repair Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm C1336 does not return.

Approximate repair cost

Repair cost depends on which component actually failed. Typical scenarios for C1336 (parts and labor, USD, independent shop rates): Repair coil wiring or connector: $80–$250; Replace spark plugs: $90–$250; Replace an ignition coil: $150–$380. Overall, fixing C1336 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

What does OBD2 code C1336 mean?

C1336 — C1336 — ABS Inlet Valve Coil RR Circuit Excessive Temperature: Causes, Symptoms & Fix. A fault in the ignition system. Short, gentle driving to a shop is usually possible. Typical causes: moisture or oil in the spark plug wells, damaged coil wiring or connector, worn spark plugs or wrong plug gap.

How much does it cost to fix C1336?

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

Is it safe to drive with C1336?

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.

What is the most common cause of C1336?

The most common causes are: moisture or oil in the spark plug wells, damaged coil wiring or connector, worn spark plugs or wrong plug gap.

Will C1336 clear itself?

Sometimes C1336 clears after a few drive cycles if the fault was intermittent — for example a loose connector or a tank of bad fuel. The underlying cause usually remains, so the code tends to return. Clear it once; if it comes back, diagnose rather than erase it repeatedly.

C1336 — C1336 — ABS Inlet Valve Coil RR Circuit Excessive Temperature: Causes, Symptoms & Fix

When the anti-lock braking system's electronic control unit detects that the right-rear inlet valve coil has climbed above its safe operating temperature, it stores diagnostic trouble code C1336. This particular fault belongs to the chassis DTC family, which covers problems outside the powertrain. The inlet valve is a critical component inside the ABS hydraulic module — it meters brake pressure to the rear-right wheel during a panic stop or slippery-surface braking. Each valve has an electromagnetic coil that the controller activates thousands of times per second to modulate pressure. Excessive heat degrades the coil's insulation, changes its electrical resistance, and can permanently damage the valve assembly if the condition persists.

The module does not set C1336 on a single brief over-temperature event. It monitors coil temperature indirectly through the electrical signature — current draw and resistance — and flags the code only after the condition repeats under similar driving or braking patterns. Freeze-frame data stored alongside the code shows which vehicle speed, brake application intensity, and ambient temperature were present when the fault first appeared. Use that snapshot to recreate the scenario during road testing.

Common symptoms of C1336

  • ABS warning lamp illuminated on the instrument cluster
  • Traction control or stability control warning light may also activate
  • Brake pedal feel feels normal during ordinary driving, but the system does not activate during panic stops
  • The right-rear wheel may lock prematurely under hard braking
  • Reduced effectiveness of ABS intervention when braking on wet or loose surfaces
  • In rare cases, the pump motor runs more frequently as the module compensates for valve irregularities

What causes C1336

  • Failing ABS inlet valve coil — the electromagnetic winding overheats due to age, insulation breakdown, or repeated heavy use
  • Wiring harness or connector damage near the rear ABS sensor or valve assembly — broken insulation, corrosion, or loose pins increase resistance and generate heat
  • Poor ground connection at the hydraulic control unit, causing the coil to draw excess current
  • Short or open circuit in the valve coil control line within the ABS module
  • Excessive brake use — sustained heavy braking on steep grades or track driving can push the valve assembly beyond its thermal design
  • Internal fault within the ABS hydraulic unit itself, where the coil is encapsulated in the module

How to diagnose C1336

  1. Connect an OBD2 scanner and confirm C1336 is stored. Record the freeze-frame data — vehicle speed, brake switch status, and any ambient temperature information — then attempt to replicate those exact conditions during a test drive with hard braking.
  2. Perform a visual inspection of the wheel speed sensor wiring and the harness routing near the right-rear axle and suspension components. Look for chafed insulation, corroded connectors, or damaged boots caused by road debris.
  3. Check the ground straps and power feeds at the ABS module. A weak ground produces higher-than-normal current draw, which generates excess heat in the valve coils.
  4. Using a multimeter, measure the resistance of the right-rear inlet valve coil through the module connector. Compare the reading to factory specifications — a value outside the acceptable range confirms a failed coil.
  5. Inspect for any related chassis or steering-angle DTCs that may indicate a systemic electrical problem rather than an isolated valve failure.
  6. Clear the code and repeat the braking sequence that triggered the fault. If C1336 returns immediately, the valve coil or the internal module circuit is the root cause.

Repair options and cost

  • Repair damaged wiring harness or connector: $80–$250
  • Replace individual ABS inlet valve coil (if the module design allows separate coil replacement): $200–$450
  • Replace the complete ABS hydraulic control unit: $600–$1,200

How much does it cost to fix C1336?

Labor rates at independent shops typically run $75–$120 per hour. Wiring repair is the least expensive path if the harness shows visible damage. Individual valve coil replacement is feasible on some makes — particularly certain Ford and Mazda models — but many manufacturers require full module replacement, which drives the total bill toward the higher end. Expect to pay between $250 and $1,200 depending on which repair strategy the vehicle requires. Get a clear diagnosis before authorizing work — swapping the module is a significant expense that should only happen after electrical testing rules out wiring and connector faults.

Can you drive with C1336?

Proceed with caution. The vehicle retains normal braking function without ABS intervention, but the right-rear wheel can lock under heavy braking, increasing stopping distance and risking a loss of directional control on slick surfaces. Avoid hard braking, high-speed cornering, and overloaded conditions until the fault is resolved. If the ABS warning light is flashing rather than solid, stop driving and have the vehicle towed — a flashing light indicates an active electrical fault that could affect other safety systems.

Related OBD2 codes