AutoCodes – Generic – P1587

P1587 Code - CAN Communication Error MT/AT Recognition Error

Quick Answer

Because both A/T and M/T fuel control map is inputted in one type of Engine Control Module (ECM) and selecting option is possible, one type is applied to both A/T and M/T option. Common causes include Faulty Engine Control Module (ECM), ECM harness is open or shorted, 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: P1587 indicates CAN Communication Error MT/AT Recognition Error.
Common causes: Common causes include Faulty Engine Control Module (ECM), ECM harness is open or shorted, 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 22,605

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on May 20, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P1587 Description

Because both A/T and M/T fuel control map is inputted in one type of Engine Control Module (ECM) and selecting option is possible, one type is applied to both A/T and M/T option.
When ECM is installed to vehicle, A/T and M/T recognition is performed by ECM automatically as checking whether ground line is grounded or opened.

OBDII Code P1587 - CAN Communication Error MT/AT Recognition Error - AutoCodes.com — P1587 Code - CAN Communication Error MT/AT Recognition Error

What does this mean?

What are the Possible Causes of the DTC P1587?

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

How to Fix the DTC P1587?

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 P1587 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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Information for Specific Makes

P1587 Buick — Cruise Control Clutch Control Circuit Low
P1587 Cadillac — Cruise Control Clutch Control Circuit Low
P1587 Chevrolet — Cruise Control Clutch Control Circuit Low
P1587 Ford — Throttle Control Unit Modulated Command Malfunction
P1587 GMC — Cruise Control Clutch Control Circuit Low
P1587 Honda — Motor Power Inverter Module Current Signal Circuit Low Input
P1587 Hyundai — CAN Communication Error MT/AT Recognition Error
P1587 Jaguar — Throttle Control Unit Modulated Command Malfunction
P1587 KIA — CAN Communication Error MT/AT Recognition Error
P1587 Mercedes-Benz — Engine Control Module Supply Voltage

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.