OBD-II Fault Code

C1751: Vehicle Speed Sensor # 1 Output Circuit Short to Vbatt

Meaning, symptoms, likely causes, diagnostic checks and repair guidance for C1751.

System family

Chassis

Manufacturer-specific

Repair category

Speed sensor

Use this category to narrow your checks before replacing parts.

Severity

Medium

Severity is a general guide. Confirm with scan-tool data and vehicle symptoms.

What C1751 usually means

Vehicle Speed Sensor # 1 Output Circuit Short to Vbatt.

Common symptoms

ABS/traction/steering/suspension warning lamp or abnormal chassis behaviour

Likely causes

Faulty speed sensor; Damaged tone wheel; Wiring fault; ABS/TCM data issue

Diagnostic checks

Inspect wheel/brake/suspension area, connectors, sensor wiring and module power/ground; Compare live speed data from relevant modules; Inspect sensor and harness

Repair guidance

Repair wiring or replace confirmed faulty sensor/tone wheel

Verification after repair

Clear code, road-test safely at low speed first, then rescan

Note: Confirm vehicle make/model/year because manufacturer-specific codes can vary; Manufacturer-specific: confirm definition and test steps in the vehicle service manual. A DTC identifies a circuit or system condition, not always the failed part.