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Engine-Codes – Generic – P1935

P1935 Code - Fuel Additive Level Low

Quick Answer

The P1935 diagnostic trouble code indicates that the fuel additive level in the vehicle is low. Common causes include Low fuel additive level in the tank, Faulty fuel additive level sensor, Clogged fuel additive lines. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P1935 indicates Fuel Additive Level Low.
Common causes
Common causes include Low fuel additive level in the tank, Faulty fuel additive level sensor, Clogged fuel additive lines.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 06, 2024
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Code P1935 Description

The P1935 diagnostic trouble code indicates that the fuel additive level in the vehicle is low. This code is often associated with vehicles equipped with diesel engines that require the use of an additive to improve fuel efficiency and reduce emissions. The fuel additive is typically stored in a separate tank and is injected into the fuel system as needed. When the additive level is low, it can impact the vehicle's performance by reducing fuel efficiency, increasing emissions, and potentially causing damage to the engine over time.

OBDII Code P1935 - Fuel Additive Level Low
P1935 Code - Fuel Additive Level Low

Common Causes of P1935

  1. Low fuel additive level in the tank
  2. Faulty fuel additive level sensor
  3. Clogged fuel additive lines
  4. Electrical issues with the fuel additive system
  5. Contaminated fuel additive

Symptoms of P1935

  1. Decreased fuel efficiency
  2. Increased emissions
  3. Engine misfires
  4. Rough idling
  5. Reduced engine performance

How to Fix P1935

  1. Check the fuel additive tank level and refill if necessary.
  2. Inspect the fuel additive level sensor for any damage or malfunction and replace if needed.
  3. Clear any clogs in the fuel additive lines and ensure proper flow.
  4. Check the electrical connections and wiring related to the fuel additive system for any issues.
  5. Drain and replace the contaminated fuel additive if necessary.

Cost to Fix P1935

The typical repair costs for addressing a low fuel additive level code can vary depending on the specific issue and the vehicle's make and model. In general, repairing this issue may range from $100 to $500, including parts and labor. However, it's essential to consider that diagnosis time and labor rates can vary between auto repair shops, so it's advisable to obtain a specific estimate from a trusted mechanic.

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Code P1935 Information for Specific Makes

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

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