OBD Guide
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C2125

No Signal from Transmitter ID 5 In Main Mode

C2125 is an OBD-II diagnostic trouble code meaning: No Signal from Transmitter ID 5 In Main Mode. Common causes: transmitter id 5 fault, open or short circuit in wiring harness. Estimated repair cost: $56–167.

Severity
⚠️ Medium
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$56–167 (est.)

Symptoms

  • Check Engine Light Is On
  • Disabling the restraint system
  • Unstable car operation

Causes

  • Transmitter ID 5 fault
  • Open or short circuit in wiring harness
  • Problems with the control unit
  • Contact corrosion

How to Fix

  1. Check the integrity of the wiring harness
  2. Check contacts of transmitter ID 5
  3. Replace ID 5 transmitter if necessary
  4. Check the control unit for errors

Related codes

C2124C2126B0001

FAQ

What does the C2125 code mean?

C2125 is an OBD-II diagnostic trouble code that indicates: No Signal from Transmitter ID 5 In Main Mode

What causes a C2125 error code?

The most common causes of C2125 include: Transmitter ID 5 fault; Open or short circuit in wiring harness; Problems with the control unit; Contact corrosion.

How do I fix a C2125 diagnostic trouble code?

To fix C2125: Check the integrity of the wiring harness. Check contacts of transmitter ID 5. Replace ID 5 transmitter if necessary. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with C2125?

Do not drive — repair immediately

How much does it cost to fix C2125?

The estimated repair cost for C2125 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat