OBD Guide
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P161B

Battery Disconnect/TCM Internal

P161B is an OBD-II diagnostic trouble code meaning: Battery Disconnect/TCM Internal. Common causes: tcm power supply circuit open, problems with the battery or terminals. Estimated repair cost: $1–56.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$1–56 (est.)

Symptoms

  • Gear shifting problems
  • Switching to emergency mode of the gearbox
  • Check Engine Light Illuminates
  • Unstable engine operation

Causes

  • TCM power supply circuit open
  • Problems with the battery or terminals
  • Fuse or relay failure
  • Internal TCM faults

How to Fix

  1. Check TCM power supply continuity
  2. Inspect battery terminals and connections
  3. Check fuses and relays associated with the TCM
  4. Diagnose the internal workings of TCM

Related codes

P161AP161C

FAQ

What does the P161B code mean?

P161B is an OBD-II diagnostic trouble code that indicates: Battery Disconnect/TCM Internal

What causes a P161B error code?

The most common causes of P161B include: TCM power supply circuit open; Problems with the battery or terminals; Fuse or relay failure; Internal TCM faults.

How do I fix a P161B diagnostic trouble code?

To fix P161B: Check TCM power supply continuity. Inspect battery terminals and connections. Check fuses and relays associated with the TCM. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P161B?

Yes, but get it checked soon

How much does it cost to fix P161B?

The estimated repair cost for P161B is $1–56. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat