OBD Guide
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B1370

Control Module Ignition ON and Start Circuit

B1370 is an OBD-II diagnostic trouble code meaning: Control Module Ignition ON and Start Circuit. Common causes: open or short circuit in wiring harness, faulty ignition relay. Estimated repair cost: $56–167.

Severity
🔴 High
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$56–167 (est.)

Symptoms

  • Engine won't start
  • Problems turning on the ignition
  • Flashing indicator on the instrument panel

Causes

  • Open or short circuit in wiring harness
  • Faulty ignition relay
  • Blown fuse
  • Problems with the control module

How to Fix

  1. Check fuses and ignition relays
  2. Inspect the wiring harness for damage
  3. Check contacts for corrosion
  4. Test the control module

Related codes

B1371B1372P0351

FAQ

What does the B1370 code mean?

B1370 is an OBD-II diagnostic trouble code that indicates: Control Module Ignition ON and Start Circuit

What causes a B1370 error code?

The most common causes of B1370 include: Open or short circuit in wiring harness; Faulty ignition relay; Blown fuse; Problems with the control module.

How do I fix a B1370 diagnostic trouble code?

To fix B1370: Check fuses and ignition relays. Inspect the wiring harness for damage. Check contacts for corrosion. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1370?

Yes, but get it checked soon

How much does it cost to fix B1370?

The estimated repair cost for B1370 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat