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Engine-Codes – Generic – P1835

P1835 Code - Kick-Down Switch Circuit

Quick Answer

The P1835 diagnostic trouble code (DTC) refers to a malfunction in the kick-down switch circuit of a vehicle. Common causes include Faulty kick-down switch, Damaged or corroded wiring/connectors, Defective ECM/TCM. 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
P1835 indicates Kick-Down Switch Circuit.
Common causes
Common causes include Faulty kick-down switch, Damaged or corroded wiring/connectors, Defective ECM/TCM.
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 07, 2024
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Code P1835 Description

The P1835 diagnostic trouble code (DTC) refers to a malfunction in the kick-down switch circuit of a vehicle. The kick-down switch is a component in automatic transmission systems that allows the driver to manually downshift the transmission for more power when needed, such as during acceleration or climbing hills. When this switch circuit malfunctions, it can affect the vehicle's performance by either not allowing the transmission to downshift when required or causing it to downshift unexpectedly.

OBDII Code P1835 - Kick-Down Switch Circuit
P1835 Code - Kick-Down Switch Circuit

Common Causes of P1835

  1. Faulty kick-down switch
  2. Damaged or corroded wiring/connectors
  3. Defective ECM/TCM
  4. Electrical shorts or open circuits
  5. Water intrusion or corrosion in the switch circuit

Symptoms of P1835

  1. Delayed or rough downshifting
  2. Inability to downshift when accelerating
  3. Engine revving without corresponding acceleration
  4. Decreased fuel efficiency
  5. Transmission shifting erratically

How to Fix P1835

  1. Begin by diagnosing the specific cause of the P1835 code using a scan tool to read the fault codes and conducting a visual inspection of the kick-down switch and related components.
  2. Test the kick-down switch for proper functionality by checking for continuity and proper voltage output when the accelerator pedal is depressed.
  3. Inspect the wiring harness and connectors for any signs of damage, corrosion, or loose connections. Repair or replace as necessary.
  4. If the kick-down switch is found to be faulty, replace it with a new one following the manufacturer's guidelines.
  5. Clear the DTC and test drive the vehicle to ensure that the issue has been resolved and that the transmission is functioning correctly.

Cost to Fix P1835

The cost of repairing a P1835 kick-down switch circuit issue can vary depending on the specific cause of the problem and the vehicle's make and model. In general, the cost of parts such as a new kick-down switch can range from $50 to $200, while labor costs can range from $100 to $300. Overall, the total repair cost for this issue is typically in the range of $150 to $500. It's important to note that these estimates are approximate and can vary based on factors such as location, shop rates, and the extent of the repair needed. It is advisable to consult with a qualified mechanic or repair shop for a more accurate cost estimate based on your specific situation.

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Code P1835 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.

Frequently Asked Questions about P1835 Code

1. What does the OBDII code P1835 mean?

P1835 refers to a problem in the kick-down switch circuit, which is responsible for signaling the transmission to downshift during acceleration.

2. What are the common symptoms of code P1835?

Symptoms include delayed or improper downshifting, reduced acceleration, and possibly the illumination of the check engine light.

3. What causes code P1835 to appear?

Common causes include a faulty kick-down switch, damaged wiring or connectors in the circuit, or issues with the transmission control module (TCM).

4. How do I diagnose code P1835?

Inspect the kick-down switch and its wiring for damage, check for corrosion at connectors, and perform diagnostic tests on the TCM if necessary.

5. Can I drive my car with code P1835?

Driving with P1835 may lead to reduced performance and possible transmission damage, so it’s best to address the issue promptly.

6. How do I fix the P1835 code?

Repairs may include replacing the kick-down switch, repairing damaged wiring, cleaning connectors, or reprogramming the transmission control module.

7. How much does it cost to repair code P1835?

Repair costs vary, but replacing a kick-down switch typically costs $100-$300, while wiring repairs or module reprogramming may add to the expense.

8. Does code P1835 affect fuel efficiency?

Yes, improper downshifting can lead to inefficient engine operation, potentially reducing fuel economy.

9. Can a dirty transmission cause code P1835?

A dirty or contaminated transmission is unlikely to directly cause P1835 but could contribute to broader transmission issues that affect the kick-down switch’s operation.

10. Do I need a mechanic to fix code P1835?

If you’re experienced with automotive repairs, you can attempt basic fixes like inspecting the switch and wiring. Otherwise, a mechanic is recommended for proper diagnosis and repair.

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