4/9/2021 DTC P0191-P0193, P127C, or P127D - 6.6L L5P • 2017 Chevrolet Silverado - 4WD • MotoLogic
https://www.motologic.com/car/2017_chevrolet_silverado_4wd_100305743/article/2017_chevrolet_silverado_4wd_100305743_061ff5f277d7d06be678
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DTC P0191
DTC P0192
DTC P0193
DTC P127C
DTC P127D
DTC P0191-P0193, P127C, or P127D - 6.6L L5P
Diagnostic Instructions
Perform the Diagnostic System Check prior to using this diagnostic procedure: Diagnostic System Check - Vehicle
Review the description of Strategy Based Diagnosis: Strategy Based Diagnosis
An overview of each diagnostic category can be found here: Diagnostic Procedure Instructions
DTC Descriptor
Fuel Rail Pressure Sensor 1 Performance
Fuel Rail Pressure Sensor 1 Circuit Low Voltage
Fuel Rail Pressure Sensor 1 Circuit High Voltage
Fuel Rail Pressure Sensor 2 Circuit Low Voltage
Fuel Rail Pressure Sensor 2 Circuit High Voltage
Diagnostic Fault Information
Typical Scan Tool Data
Circuit Short to Ground
Open/High
Resistance Short to Voltage
Signal
Performance
5 V Reference
P0193, P06A3,
P127D
P0193, P127D
P0193, P06A3,
P127D
—
Fuel Rail Pressure Sensor 1 — Signal P0192 P0193 P0193 P0191
Fuel Rail Pressure Sensor 2 — Signal P127C P127D P127D P0191
Low Reference — P0193, P127D P0193, P127D P0191
Fuel Rail Pressure Sensor 1
Circuit Short to Ground Open Short to Voltage
Operating Conditions: Engine = Running
Parameter Normal Range: 0.4 to 4.5 V
5 V Reference 5 V 5 V 5 V
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4/9/2021 DTC P0191-P0193, P127C, or P127D - 6.6L L5P • 2017 Chevrolet Silverado - 4WD • MotoLogic
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Circuit/System Description
For an overview of the component/system, refer to: Fuel System Description
Conditions for Running the DTC
P0191
DTC P0116-P0119, P0128, P0192, P0193, P111E, P262B = Not set
ECT Sensor = Greater than −40°C (−40°F)
Circuit Short to Ground Open Short to Voltage
Signal 0 V 5 V 5 V
Low Reference — 0.96 V —
Fuel Rail Pressure Sensor 2
Circuit Short to Ground Open Short to Voltage
Operating Conditions: Engine = Running
Parameter Normal Range: 0.4 to 4.5 V
5 V Reference 5 V 5 V 5 V
Signal 0 V 5 V 5 V
Low Reference — 4.06 V —
Circuit Description
5 V Reference Regulated voltage supplied by the control module.
Signal The control module input circuit has an internal resistance connected to 5 V.
Low Reference Grounded through the control module.
Component Description
B47B Fuel Rail Pressure Sensor — Fuel Rail Pressure
Sensor 1
The sensor measures the pressure in the component: Fuel Rail — The
signal voltage increases when the pressure increases.
B47B Fuel Rail Pressure Sensor — Fuel Rail Pressure
Sensor 2
The sensor measures the pressure in the component: Fuel Rail — The
signal voltage decreases when the pressure increases.
K20 Engine Control Module
The control module controls a series of actuators to ensure optimal engine
performance. The control module does this by reading values from a variety
of sensors, interprets the data and adjusts the engine actuators accordingly.
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4/9/2021 DTC P0191-P0193, P127C, or P127D - 6.6L L5P • 2017 Chevrolet Silverado - 4WD • MotoLogic
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Engine Off Time = Greater than 35 s
Ignition On
Ignition Voltage = Greater than 11 V
Frequency the DTC runs = Continuously — After the running conditions are met
P0192, P0193, P127C, P127D
Battery Voltage = Greater than 8.4 V
Ignition On or Engine Running
Frequency the DTC runs = Continuously — After the running conditions are met
Conditions for Setting the DTC
P0191
Fuel Rail Pressure Sensor 1 = Not within a calibrated range — For greater than 1 s
P0192
Fuel Rail Pressure Sensor 1 = Less than 0.25 V — For greater than 1 s
P0193
Fuel Rail Pressure Sensor 1 = Greater than 4.75 V — For greater than 1 s
P127C
Fuel Rail Pressure Sensor 2 = Less than 0.25 V — For greater than 1 s
P127D
Fuel Rail Pressure Sensor 2 = Greater than 4.75 V — For greater than 1 s
Actions Taken When the DTC Sets
DTCs listed in the DTC Descriptor Category = Type A DTC
Conditions for Clearing the DTC
DTCs listed in the DTC Descriptor Category = Type A DTC
Reference Information
Schematic Reference
Engine Controls Schematics
Connector End View Reference
Component Connector End Views
Component View Reference
Powertrain Component Views
Electrical Information Reference
Circuit Testing
Connector Repairs
Testing for Intermittent Conditions and Poor Connections
Wiring Repairs
DTC Type Reference
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Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References
Circuit/System Verification
1. Ignition » On / Vehicle » In Service Mode
2. Verify the scan tool parameter: Fuel Rail Pressure Sensor 1 & Fuel Rail Pressure Sensor 2 = 0.4 to 4.5 V and changes
⇒ If not between 0.4 and 4.5 V or does not change
Refer to: Circuit/System Testing
⇓ If between 0.4 and 4.5 V and changes
Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you
observed from the Freeze Frame/Failure Records data.
Verify the DTC does not set.
⇒ If the DTC sets
Refer to: Circuit/System Testing
⇓ If the DTC is not set
All OK.
Circuit/System Testing
Note: It may take up to 2 min for all vehicle systems to power down before an accurate ground or low reference circuit continuity
test can be performed.
1. Ignition/Vehicle & All vehicle systems » Off
2. Disconnect the electrical connector: B47B Fuel Rail Pressure Sensor
3. Test for less than 10 Ω between the test points: Low Reference circuit terminal 3 & Ground
⇒ If 10 Ω or greater
1. Disconnect the appropriate electrical connector: @ K20 Engine Control Module
2. Test for less than 2 Ω between the test points: Low Reference circuit terminal 3 @ Component harness & Terminal 57 @ Control
module harness
⇒ If 2 Ω or greater » Repair the open/high resistance in the circuit.
⇒ If less than 2 Ω » Replace the component: K20 Engine Control Module
⇓ If less than 10 Ω
Ignition » On / Vehicle » In Service Mode
Test for 4.8 to 5.2 V between the test points: 5 V Reference circuit terminal 1 & Low Reference circuit terminal 3
⇒ If less than 4.8 V
1. Ignition/Vehicle » Off
2. Disconnect the appropriate electrical connector: @ K20 Engine Control Module
3. Test for infinite resistance between the test points: 5 V Reference circuit terminal 1 @ Component harness & Ground
⇒ If less than infinite resistance » Repair the short to ground on the circuit.
⇓ If infinite resistance
Test for less than 2 Ω between the test points: 5 V Reference circuit terminal 1 @ Component harness & Terminal 59 @ Control module
harness
⇒ If 2 Ω or greater » Repair the open/high resistance in the circuit.
⇒ If less than 2 Ω » Replace the component: K20 Engine Control Module
⇒ If greater than 5.2 V
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1. Ignition/Vehicle » Off
2. Disconnect the appropriate electrical connector: @ K20 Engine Control Module
3. Ignition » On / Vehicle » In Service Mode
4. Test for less than 1 V between the test points: 5 V Reference circuit terminal 1 @ Component harness & Ground
⇒ If 1 V or greater » Repair the short to voltage on the circuit.
⇒ If less than 1 V » Replace the component: K20 Engine Control Module
⇓ If between 4.8 and 5.2 V
Verify the scan tool parameter: Fuel Rail Pressure Sensor 1 & Fuel Rail Pressure Sensor 2 = Greater than 4.8 V
⇒ If 4.8 V or less
1. Ignition/Vehicle » Off
2. Disconnect the appropriate electrical connector: @ K20 Engine Control Module
3. Test for infinite resistance between the test points:
Signal circuit terminal 4 @ Component harness & Ground
Signal circuit terminal 2 @ Component harness & Ground
⇒ If less than infinite resistance » Repair the short to ground on the circuit.
⇒ If infinite resistance » Replace the component: K20 Engine Control Module
⇓ If greater than 4.8 V
Connect a 3 A fused jumper wire between the test points:
Signal circuit terminal 4 & Ground
Signal circuit terminal 2 & Ground
Verify the scan tool parameter: Fuel Rail Pressure Sensor 1 & Fuel Rail Pressure Sensor 2 = Less than 0.4 V
⇒ If 0.4 V or greater
1. Ignition/Vehicle » Off & Remove » Jumper wire(s)
2. Disconnect the appropriate electrical connector: @ K20 Engine Control Module
3. Ignition » On / Vehicle » In Service Mode
4. Test for less than 1 V between the test points:
Signal circuit terminal 4 @ Component harness & Ground
Signal circuit terminal 2 @ Component harness & Ground
⇒ If 1 V or greater » Repair the short to voltage on the circuit.
⇓ If less than 1 V
Ignition/Vehicle » Off
Test for less than 2 Ω between the test points:
Signal circuit terminal 4 @ Component harness & Terminal 58 @ Control module harness
Signal circuit terminal 2 @ Component harness & Terminal 24 @ Control module harness
⇒ If 2 Ω or greater » Repair the open/high resistance in the circuit.
⇒ If less than 2 Ω » Replace the component: K20 Engine Control Module
⇓ If less than 0.4 V
Test or replace the component: B47B Fuel Rail Pressure Sensor
Repair Instructions
Perform the Diagnostic Repair Verification after completing the repair: Diagnostic Repair Verification
Fuel Injection Fuel Rail Fuel Pressure Sensor Replacement
For control module replacement, programming, and setup refer to: Control Module References
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4/9/2021 DTC P0191-P0193, P127C, or P127D - 6.6L L5P • 2017 Chevrolet Silverado - 4WD • MotoLogic
https://www.motologic.com/car/2017_chevrolet_silverado_4wd_100305743/article/2017_chevrolet_silverado_4wd_100305743_061ff5f277d7d06be678
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