OBD Guide
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P1126

Throttle Control Motor Relay Circuit Open

P1126 is an OBD-II diagnostic trouble code meaning: Throttle Control Motor Relay Circuit Open. Common causes: broken wire in the relay circuit, faulty throttle control relay. Estimated repair cost: $6–28.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$6–28 (est.)

Symptoms

  • Rough engine idling
  • Dips when pressing the gas pedal
  • The Check Engine light comes on
  • Reduced engine power
  • Switching to emergency mode

Causes

  • Broken wire in the relay circuit
  • Faulty throttle control relay
  • Short circuit in the circuit
  • Poor contact in connectors
  • Engine control unit malfunction

How to Fix

  1. Check the integrity of the wires in the relay circuit
  2. Test the throttle control relay
  3. Check connections and connectors
  4. Diagnose the engine control unit
  5. Replace relay if necessary

Related codes

P1125P1127P1128

Error P1126 by Vehicle Brand

LexusMazdaNissanToyotaVolkswagen

FAQ

What does the P1126 code mean?

P1126 is an OBD-II diagnostic trouble code that indicates: Throttle Control Motor Relay Circuit Open

What causes a P1126 error code?

The most common causes of P1126 include: Broken wire in the relay circuit; Faulty throttle control relay; Short circuit in the circuit; Poor contact in connectors.

How do I fix a P1126 diagnostic trouble code?

To fix P1126: Check the integrity of the wires in the relay circuit. Test the throttle control relay. Check connections and connectors. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1126?

Limited driving only, diagnose soon

How much does it cost to fix P1126?

The estimated repair cost for P1126 is $6–28. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat