AutoCodes – Jaguar – P1777 Jaguar

P1777 Jaguar Code - Engine Control Module - Transmission Control Module Retard Signal

Quick Answer

P1777 Jaguar indicates Engine Control Module - Transmission Control Module Retard Signal. Common causes include Faulty Engine Control Module (ECM), Engine Control Module (ECM) harness is open or shorted, Engine Control Module (ECM) circuit poor electrical connection. 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: P1777 Jaguar indicates Engine Control Module - Transmission Control Module Retard Signal.
Common causes: Common causes include Faulty Engine Control Module (ECM), Engine Control Module (ECM) harness is open or shorted, Engine Control Module (ECM) circuit poor electrical connection.
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.

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Code Popularity 3,952

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Sep 17, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1777 Jaguar Description

OBDII Code P1777 Jaguar - Engine Control Module - Transmission Control Module Retard Signal - AutoCodes.com — P1777 Jaguar Code - Engine Control Module - Transmission Control Module Retard Signal

What does this mean?

What are the Possible Causes of the DTC P1777 Jaguar?

Faulty Engine Control Module (ECM)
Engine Control Module (ECM) harness is open or shorted
Engine Control Module (ECM) circuit poor electrical connection

How to Fix the DTC P1777 Jaguar?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1777 Jaguar code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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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 P1777 Jaguar Code

1. What are the common symptoms of OBDII code P1777 in a Jaguar?

The common symptoms include issues with shifting gears, hesitation or jerking during acceleration, and the transmission staying in one gear.

2. What causes the OBDII code P1777 in a Jaguar?

The code P1777 is typically caused by a faulty signal between the Engine Control Module (ECM) and the Transmission Control Module (TCM).

3. How can I diagnose the OBDII code P1777 in my Jaguar?

Diagnosing this code usually involves checking the wiring connections between the ECM and TCM, testing the signal voltage, and inspecting the condition of both modules.

4. Can a bad sensor trigger the OBDII code P1777 in a Jaguar?

Yes, a malfunctioning sensor related to the transmission system, such as the speed sensor or throttle position sensor, can sometimes trigger the P1777 code.

5. What are the repair options for fixing the OBDII code P1777 in a Jaguar?

Repair options may include repairing or replacing damaged wiring, replacing the ECM or TCM if necessary, and ensuring all connections are secure and functioning properly.

6. Is it safe to continue driving with the OBDII code P1777 present in a Jaguar?

It is not recommended to drive with the P1777 code present, as it can lead to further damage to the transmission system and potentially cause safety issues on the road.

7. Can a DIY enthusiast fix the OBDII code P1777 in a Jaguar?

While some simple checks and repairs can be done by a DIY enthusiast, diagnosing and repairing the P1777 code may require specialized tools and expertise, so it is best to consult a professional mechanic.

8. How much does it typically cost to repair the OBDII code P1777 in a Jaguar?

The cost of repairing the P1777 code can vary depending on the extent of the issue, the parts needed for repair, and the labor rates of the mechanic. It is advisable to get a few quotes from different repair shops.

9. Will resetting the OBDII code P1777 in a Jaguar make it go away permanently?

Resetting the code may temporarily make it disappear, but if the underlying issue is not addressed and fixed, the code is likely to reappear once the problem resurfaces.

10. How can regular maintenance help prevent the OBDII code P1777 in a Jaguar?

Regular maintenance, including checking and servicing the transmission system, can help prevent issues that may lead to the P1777 code appearing in your Jaguar.