OBD Guide
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U1027

Invalid Or Missing Data For Engine RPM

U1027 is an OBD-II diagnostic trouble code meaning: Invalid Or Missing Data For Engine RPM. Common causes: malfunction of the crankshaft position sensor, problems with wiring or connectors. Estimated repair cost: $17–111.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$17–111 (est.)

Symptoms

  • Unstable engine operation
  • Problems starting the engine
  • Power Loss
  • Check Engine Light Is On
  • The car may go into emergency mode

Causes

  • Malfunction of the crankshaft position sensor
  • Problems with wiring or connectors
  • Engine control module (ECU) malfunction
  • Problems with the CAN data bus
  • Software error in car modules

How to Fix

  1. Check the crankshaft position sensor and its wiring
  2. Check the integrity of the CAN data bus
  3. Scan all modules for errors
  4. Update module software if necessary
  5. Check and, if necessary, replace the engine control module

Related codes

U1026U1028P0335P0336

FAQ

What does the U1027 code mean?

U1027 is an OBD-II diagnostic trouble code that indicates: Invalid Or Missing Data For Engine RPM

What causes a U1027 error code?

The most common causes of U1027 include: Malfunction of the crankshaft position sensor; Problems with wiring or connectors; Engine control module (ECU) malfunction; Problems with the CAN data bus.

How do I fix a U1027 diagnostic trouble code?

To fix U1027: Check the crankshaft position sensor and its wiring. Check the integrity of the CAN data bus. Scan all modules for errors. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with U1027?

Limited driving only, diagnose soon

How much does it cost to fix U1027?

The estimated repair cost for U1027 is $17–111. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat