OBD Guide
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U1950

UPB Communication Bus Fault

U1950 is an OBD-II diagnostic trouble code meaning: UPB Communication Bus Fault. Common causes: open or short circuit in upb circuit, fault in one of the modules connected to the upb bus. Estimated repair cost: $17–111.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$17–111 (est.)

Symptoms

  • Some car electronic systems do not work
  • Check Engine Light Is On
  • Problems starting the engine
  • Dashboard malfunctions

Causes

  • Open or short circuit in UPB circuit
  • Fault in one of the modules connected to the UPB bus
  • Problems with module power supply
  • Corrosion of contacts or connectors

How to Fix

  1. Check the integrity of the wiring and connectors in the UPB circuit
  2. Check power supply and grounding of modules connected to the UPB bus
  3. Scan all modules for additional errors
  4. Replace the faulty module if found
  5. Repair only from an authorized dealer

Related codes

U1951U1952U1953

FAQ

What does the U1950 code mean?

U1950 is an OBD-II diagnostic trouble code that indicates: UPB Communication Bus Fault

What causes a U1950 error code?

The most common causes of U1950 include: Open or short circuit in UPB circuit; Fault in one of the modules connected to the UPB bus; Problems with module power supply; Corrosion of contacts or connectors.

How do I fix a U1950 diagnostic trouble code?

To fix U1950: Check the integrity of the wiring and connectors in the UPB circuit. Check power supply and grounding of modules connected to the UPB bus. Scan all modules for additional errors. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with U1950?

Yes, but get it checked soon

How much does it cost to fix U1950?

The estimated repair cost for U1950 is $17–111. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat