OBD Guide
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P18C0

Internal Mode Switch 'B' Circuit Stuck On Invalid Voltage Range

P18C0 is an OBD-II diagnostic trouble code meaning: Internal Mode Switch 'B' Circuit Stuck On Invalid Voltage Range. Common causes: internal switch 'b' faulty, open or short circuit in the circuit. Estimated repair cost: $17–56.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$17–56 (est.)

Symptoms

  • Incorrect gear shifting
  • Check Engine light comes on
  • Switching to emergency mode of the gearbox
  • Problems starting the engine

Causes

  • Internal switch 'B' faulty
  • Open or short circuit in the circuit
  • Problems with the transmission control unit
  • Contact corrosion

How to Fix

  1. Check the continuity of the switch circuit
  2. Check voltage at switch
  3. Replace internal switch 'B' if necessary
  4. Check transmission control unit

Related codes

P18B0P18C1

FAQ

What does the P18C0 code mean?

P18C0 is an OBD-II diagnostic trouble code that indicates: Internal Mode Switch 'B' Circuit Stuck On Invalid Voltage Range

What causes a P18C0 error code?

The most common causes of P18C0 include: Internal switch 'B' faulty; Open or short circuit in the circuit; Problems with the transmission control unit; Contact corrosion.

How do I fix a P18C0 diagnostic trouble code?

To fix P18C0: Check the continuity of the switch circuit. Check voltage at switch. Replace internal switch 'B' if necessary. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P18C0?

Yes, but get it checked soon

How much does it cost to fix P18C0?

The estimated repair cost for P18C0 is $17–56. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat