What is P0703 : Engine Error Code Causes Explained
The P0703 engine trouble code indicates a transmission range sensor circuit issue. This guide covers its prevalent causes, symptoms, and practical troubleshooting ways to help diagnose and fix it.
How to Identify a DTCs Number
Understand, these trouble codes (DTCs) are 5 characters: 1 letter, 4 numbers. P-Powertrain indicates the fault code’s location. Generic or manufacturer-specific codes are indicated by the first digit. The second digit denotes the subsystem (7=transmission). The last two numbers describe the issue.
The P0703 engine trouble code is detected by an OBD-II scanner connected to the vehicle’s diagnostic port under the dashboard. When the check engine light comes on, the scanner analyses engine control module error codes and displays DTC numbers like P0703.
CAUSES: P0703 Engine Code
- Faulty or misadjusted brake light switch:
The brake light switch, which is activated when the brake pedal is depressed, can fail or become misadjusted, sending incorrect signals to the PCM. - Wiring and connector issues:
Problems with the wiring harness, connectors, or other components within the brake switch “B” circuit can interrupt the signal flow This includes damaged, disconnected, corroded, or shorted wiring and connectors. - Blown fuse or fusible link:
A blown fuse or fusible link in the brake light circuit can also trigger the P0703 code. - PCM failure:
Although less common, a faulty PCM can also be a contributing factor.
Risk Level of P0703 Error Code:
P0703 engine trouble code is Medium Risk. To maintain vehicle safety and reliability, it should be treated immediately, even if it does not cause engine failure. Repair and diagnosis should be done quickly to avoid problems.
Common Car Brands Affected by P0703 Code:
The P0703 engine error code is commonly found in the following list.
- Mazda
- Honda
- Volkswagen
- Mercedes
Video: P0703 Engine Error code
FAQ’s
What is P0703 Engine Error Code?
The P0703 Engine Error Code indicates a malfunction in the transmission range (TR) sensor circuit, which can affect gear selection and engine performance.
What causes the P0703 Engine Error Code?
The P0703 Engine Error Code is usually caused by a Faulty or misadjusted brake light switch, Wiring and connector issues, blown fuse or fusible link, PCM failure or issues in the Transmission Control Module (TCM).
What’s the risk level of P0703 Engine Error Code?
The risk level of the P0703 Engine Error Code is Medium, as it may cause shifting problems, reduced drivability, or temporary limp mode activation.
Which vehicles are affected by the P0703 Engine Error Code?
The P0703 Engine Error Code is commonly found in vehicles with electronically controlled transmissions, including Mazda, Honda, Volkswagen, and Mercedes models.