Engine-Codes - Generic - B1257

B1257 - Air Temperature External Sensor Circuit Short To Ground

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3  What is this?

B1257 Possible Causes

  • Faulty Air Temperature External Sensor
  • Air Temperature External Sensor harness is open or shorted
  • Air Temperature External Sensor circuit poor electrical connection

How do I fix code B1257

Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

Cost of diagnosing the B1257 code

Labor: 1.0

The cost of diagnosing the B1257 code is 1.0 hour of labor. The auto repair labor rates vary widely across the country, and even within the same city. Most auto repairs shops charge between $75 and $150 per hour.

Possible Symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

B1257 Meaning

The Powertrain Control Module (PCM) monitors the Air Temperature External Sensor. The PCM sets the OBDII code when the Air Temperature External Sensor is not to factory specifications.

B1257 More Information

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