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moparfl
moparfl, ASE Certified Technician
Category: Dodge
Satisfied Customers: 6330
Experience:  ASE Master Tech Gold level Chrysler Status 30 years dealership exp
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What does this error code mean? P2608 Intake Air Heater Relay 2 High

Customer Question

What does this error code mean? P2608 Intake Air Heater Relay 2 High
Submitted: 7 years ago.
Category: Dodge
Expert:  moparfl replied 7 years ago.
What year and model are you working on??
Customer: replied 7 years ago.
2003 Dodge Ram 2500 Cummings CA model (not HO), 4x4 long bed, auto
Expert:  moparfl replied 7 years ago.

SympXXXXX XXXXXst:

P0542-HIGH VOLTAGE ON THE #1 INTAKE AIR HEATER RELAY

P2608-HIGH VOLTAGE AT THE #2 INTAKE AIR HEATER RELAY

Test Note: All symptoms listed above are diagnosed using the same tests.

The title for the tests will be P0542-HIGH VOLTAGE ON THE

#1 INTAKE AIR HEATER RELAY.

When Monitored and Set Condition:

P0542-HIGH VOLTAGE ON THE #1 INTAKE AIR HEATER RELAY

When Monitored: When the ignition is on.

Set Condition: When the signal from the #1 Intake Air Heater output does not match the

signal from the #1 Intake Air Heater feedback.

P2608-HIGH VOLTAGE AT THE #2 INTAKE AIR HEATER RELAY

When Monitored: When the ignition is on.

Set Condition: When the signal from the #2 Intake Air Heater output does not match the

signal from the #2 Intake Air Heater feedback.

POSSIBLE CAUSES

LOOSE CONNECTION

INTAKE AIR HEATER RELAY

SIGNAL CIRCUIT SHORTED TO BATTERY NEGATIVE

ECM

INTERMITTENT CONDITION

TEST ACTION APPLICABILITY

1 Ignition on, engine not running.

With the DRBIIIt, actuate the Intake Air Heater relay.

Can you hear the Relay clicking?

ENGINE- 5.9L

CUMMINS 24V

DIESEL

Yes ! Go To 2

No ! Go To 3

2 While the relay is clicking , wiggle the wiring harness and connectors.

Does this interrupt the clicking?

ENGINE- 5.9L

CUMMINS 24V

DIESEL

Yes ! Repair the poor connection.

Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL).

No ! Go To 3

169

DRIVEABILITY - DIESEL

Customer: replied 7 years ago.
How can I actuate the Inteake Air Heater relay without an DRBIIIt?
Expert:  moparfl replied 7 years ago.
There is no way to do it without a scan tool.
Customer: replied 7 years ago.
What type of scan tool? the $90 ones Autozone sells?? will that do it?
Expert:  moparfl replied 7 years ago.
No thoses will not work they are just code readers. You will need a snapon or mac tools or a otc tools scan tool and they sell for 3 to 4 thousand dollars.

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