KC-328

11/30/22, 12:29 PM
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Diagnostic Trouble Codes (DTC) P208064, P208464,
P242B64 and P246F64 Lighting The
Malfunction Indicator Lamp (MIL) - US17+OBD19
And Newer Emissions, Model Years 2020 and
Newer
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Internal Content
Following is an example of temperature noise during regeneration or steady
engine operation which is considered un-acceptable.
This example shows T3 having noise in temperature reading while T1, T2 are
steady. Typically T1 is expected to have most noise in exhaust temperature,
followed by T2, followed by T3 as there is thermal inertia between T1, T2 and
T3. Only during AHI injection (Egs: Regeneration), T2 and T3 can increase faster
than T1. All other times T1 always leads, T2, T3, T4.
Even for T1 sudden increase of temperature of ~50F and sudden drop of ~50F
within seconds is unrealistic. In this example T3 increasing and dropping
+-100F is a clear sign of sensor/harness/ACM issue.
SISTER SOLUTION:
K03573329
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No parts should be replaced for these fault codes unless a definite sensor
failure is found.
Fault Tracing Procedure:
UI the vehicle to sit until the engine and exhaust have reached
1. Allow
; Live
ambient (air) temperature.
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2. Turn the ignition to ON, engine OFF.
2. Using Premium Tech Tool (PTT), run either of the operations below:
• 2545-08-03-02 Exhaust Aftertreatment Diagnostics, option A
- This will provide a numerical view of exhaust temperatures.
• 2589-08-03-02 Exhaust Aftertreatment System, Service
Regeneration
- This will provide a graphical view of exhaust temperatures.
3. Ensure that the sensor readings are within 10 °C (18 °F) of
one another before starting the engine.
4. Start the engine.
5. Monitor exhaust temperatures on PTT:
• The sensor temperatures should rise in the order of 1, 2, 3, 4 as
shown below after starting the engine.
6. Evaluate results:
• If the sensor readings are equal at ambient temperature and rise
in the correct order when the engine is running: No further fault
tracing should be performed. Clear the DTCs and return the vehicle to
service.
• If one or more sensors are displaying a different reading from
the others or are spiking instead of smoothly increasing with the
engine running: The sensor(s) should be suspected to be faulty.
• If the temperature sensor values rise out of order: The sensors
should be checked to ensure they are installed in the correct positions.
An example of proper temperature sensor function when engine is cold
(shutdown overnight). All 4 temperature sensors are expected read within
10F of each other and ambient temperature.
Once engine is warmed (idle for few minutes), taking vehicle to high idle
(>1000rpm) typically should show temperatures similar to picture below.
T1 > T2 > T3 > T4.
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NOTE: T4 is only valid for OBD19 and Newer Vehicles.
This CBR will be updated when new information is available.
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Tags
k47838695
p2080-64
p208064
p208464
p246f64
mack
p2084-64
p242b64
p242b-64
p246f-64
volvo
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