Faulty injection sensor solenoid winding or internal mechanical failure; Damaged or corroded electrical connector at the solenoid; Chafed, broken, or shorted wiring in the solenoid circuit; Engine control module (ECM) output driver failure; Contamination or debris blocking the solenoid valve, causing performance deviation; Poor ground connection for the solenoid circuit

DTC codes / Mercedes-Benz codes / P1350

P1350 · Mercedes-BenzInjection Sensor Solenoid

Q: What does code P1350 mean?

Injection Sensor Solenoid. P1350 on Mercedes-Benz vehicles indicates that the engine control module has detected a fault in the injection sensor solenoid circuit, which is the solenoid valve responsible for modulating fuel delivery in the injection system. The computer monitors the solenoid's electrical circuit and recognizes an abnormal condition such as an open, short, or performance deviation from expected values. This code is manufacturer-specific and typically points to a failure within the solenoid itself, its wiring, or the control module's output stage.

P1350 on Mercedes-Benz vehicles indicates that the engine control module has detected a fault in the injection sensor solenoid circuit, which is the solenoid valve responsible for modulating fuel delivery in the injection system. The computer monitors the solenoid's electrical circuit and recognizes an abnormal condition such as an open, short, or performance deviation from expected values. This code is manufacturer-specific and typically points to a failure within the solenoid itself, its wiring, or the control module's output stage.

SystemPowertrain

Code typeMercedes-Benz specific

SeverityMedium

Fix difficultyIntermediate

AreaIgnition system and misfire

Symptoms you may notice

Illumination of the check engine light, often with no other noticeable symptoms
Rough idle or stumbling during acceleration due to improper fuel delivery
Reduced engine performance or a sudden loss of power under load
Increased fuel consumption as the injection system struggles to maintain correct mixture
In rare cases, the engine may enter limp mode or hesitate during gear changes

Common causes, most likely first

Faulty injection sensor solenoid winding or internal mechanical failure
Damaged or corroded electrical connector at the solenoid
Chafed, broken, or shorted wiring in the solenoid circuit
Engine control module (ECM) output driver failure
Contamination or debris blocking the solenoid valve, causing performance deviation
Poor ground connection for the solenoid circuit

How to diagnose and fix it

Perform a visual inspection of the solenoid connector and wiring for damage or corrosion
Check the solenoid's resistance with a multimeter and compare to factory specifications
Test the solenoid circuit for voltage and ground signals using a wiring diagram and scan tool
Verify that the ECM is commanding the solenoid correctly by monitoring live data
Clean or replace the injection sensor solenoid if electrically or mechanically faulty
Repair any damaged wiring or connectors and clear the code to verify the repair
If the circuit tests good, diagnose the ECM driver circuit for internal failure

What Mercedes Techs Check Before Replacing the Solenoid

A common misdiagnosis is replacing the injection sensor solenoid when the real problem is a chafed wire harness near the engine block, often caused by heat and vibration.
The ECM driver for this solenoid can fail intermittently, so a solenoid that tests good when cold may still set the code when hot; always perform tests under operating conditions.
Contaminated engine oil or fuel can cause the solenoid valve to stick, leading to a performance code without any electrical fault, so check service history and fluid condition.
This code can be set by a poor ground connection at the engine block, which affects multiple solenoids and sensors, so inspect and clean ground points before condemning parts.
On some Mercedes-Benz models, the injection sensor solenoid is part of a larger injection pump assembly, and a failing solenoid may be a symptom of internal pump wear rather than an isolated electrical issue.

Can I keep driving with P1350?

You can generally continue driving to a workshop, but avoid heavy acceleration or towing because the fault may cause poor fuel delivery and reduced engine performance. If the engine enters limp mode or runs very rough, stop driving and seek professional diagnosis to prevent further damage.

Tools that help

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Guidance is general and written for Mercedes-Benz vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.